2009-2010人教新目标八年级下学期试题
听力部分
一、录音中有五个句子，每个句子听一遍，然后从每小题ABC中选出适合每个句子的答
语。(10分)
1. A. It’ my birthday B. It’s fine today C. It’s march 12th
2. A. Yes we are B. Yes they did C. Thank you
3. A . Sure B. Many thanks C. Yes do please
4. A .It doesn’t matter B. Yes, you should C. I’d love to
5. A. Once a week B. Wednesday C. 8:15
6. A. Thank you B. Yes, I do C. the same to you
7. A .Yes, you may B. This is Tom speaking C. Yes, my name’s Tom
8. A. Yes, he is B. No, he isn’t C. He is a teacher
9. A. Yes, he didn’t B. Yes, he was C. Yes, he did
10. A. Oh I know B. I’m sorry to hear that C. It doesn’t matter
二录音中有五组对话，每组对话听一遍，然后从每小题A B C中选出能回答每个问题的正确答语。（5分）
11. What time is it now?
A. 7:20
B. 8:00
C. 7:00
12. What does the woman have for breakfast now?
A .Coffee and bread B. Rice and eggs C. Milk and fruit
13. What subjects will the boy work hard at next term?
A. Math and chemistry.
B. English and history.
C. Physics and Chinese.
14. How much will the man pay for the bananas?
A. 20yuan
B. 15yuan
C. 25yuan.
15. What are they talking about?
A. They are talking about the match.
B. They are talking about a play.
C. They are talking about a film.
三录音中有一段对话，听对话两遍，然后从每小题A B C中选出能回答每个问题的正确答语。(5分)
16. Where do you think this dialogue may happen?
A. At the supermarket.
B. In an office.
C. At a mobile phone shop.
17. What kind of mobile phone does the woman want the man to buy?
A. Motorola.
B. Nokia.
C. TCL.
18. How much does the mobile phone cost the man?
A 1800 Yuan. B. 2000 Yuan. C.1600 Yuan
19. How is the mobile phone which the man want to buy?
A. It is very expensive.
B. It is the most popular of all.
C. It looks nice and it isn’t expensive.
20. If you don’t want to buy a number, how much will you pay for the mobile phone?
A. 1800yuan
B. 1600yuan
C. 1200yuan
四: 录音中有一篇短文，听短文两遍后，然后从每小题A B C中选出能回答每个问题的正确答语。（5分）
21. When did Mr White and his wife come back from the farm?
A. In the morning.
B. In the evening. C At noon.
22. Where did they hear someone talking?
A. On the way upstairs.
B. On the way to bedroom.
C. On the way to the front door.
23. Who did they hear talking in their bedroom?
A. Two girls.
B. One boy and one girl.
C. Two boys.
24. When Mr White called out “Who is there” what happened?
A. Nobody answered.
B. Two boys came out.
C. The boys stopped talking.
25. What did Mr White find in his bedroom?
A. The light was still on. B, The radio was still on. C. The TV set was still on.
一、单项选择（每小题1分，共30分）
从A、B、C、D四个选项中选出最佳答案。
( ) 1.The two girls ________ good friends for three years.
A. have become
B. have been
C. have turned
D. are
( ) 2. —You must come back every month.
—Yes,I _______.
A. will
B. must
C. should
D. can
( ) 3. It was _____ a strong team that it couldn’t ________.
A. so, win
B. quite, beat
C. such, be beaten
D. so, be won
( ) 4. I don’t know _______ he will come tomorrow. _____ he comes, I’ll tell you.
A. if, Whether
B. whether, Whether
C. if,That
D. if, If
( ) 5. He is a lazy boy. Neither of his parents _______ going to help him do the work this time.
A. is
B. are
C. was
D. were
( ) 6. How did Ling Feng make the baby _________ ?
A. stop to crying
B. stop crying
C. to stop crying
D. to stop to cry
( ) 7. He will go back to the USA for ___ holiday.
A. two - months
B. a two - month
C. two - month
D. a two - months
( ) 8. She thinks she can get there on time, ______ she?
A. doesn’t
B. does
C. can’t
D. can
( ) 9. —How many fish did you catch?
—___________.
A. Nobody
B. None
C. No one
D. Not one
( ) 10. He has ______ the watch for a year.
A. buy
B. bought
C. have
D. had
( ) 11.Mary can’t use chopsticks and _________.
A. neither can Janee
B. Jane can neither
C. so can’t Jane
D. Jane can’t, too. A
( ) 12. Would you mind ______ smoking here?
A. me
B. I
C. my
D. mine
( ) 13. They found ______ important to study English.
A. it
B. its
C. this
D. that
( ) 14. The blacks ______ at table when I went in.
A. is sitting
B. were sitting
C. was sitting
D. sat
( ) 15. There ____ two English films next week.
A. is going to be
B. are going to have
C. will have
D. are going to be
（）16. Talking loudly _____ in the library. So keep quiet, please.
A. allows
B. doesn’t allow
C. is allowed
D. isn’t allowed
( ) 17. His new look _____ me very much. It looked very strange.
A. surprised
B. pushed
C. included
D. injured
( ) 18. —Did you have a difficult time ______ where our house is?
—Yes, It took me an hour ____ your house.
A. finding, to find
B. to find, to find C, finding, finding D. to find, finding
( ) 19.—I am sorry I lost the library book this moring.
—I am afraid you will have to _______ it.
A. look after
B. pay for
C. look for
D. decide on
( ) 20. —I like eggs and hamburgers for breakfast.
—_________. We have the same eating habits.
A. So I do.
B. Neither do I
C. So do I
D. Neither I do
( ) 21. Hearing the sad news, we all went home ________.
A. in trouble
B. in danger
C. in silence
D. in style
( ) 22. There are people _____ at the train station.
A. everything
B. anywhere C, nowhere D. somewhere
( ) 23. I am a shy girl. I will be ______ to make a speech in front of so many people.
A. disappointed
B. excite
C. outgoing
D. nervous
( ) 24. Who was the last person ____ the classroom yesterday afternoon?
A. leave
B. left
C. to leave
D. leaves
( ) 25. Would you please say it ______? I still can’t follow you.
A. loudly
B. slowly
C. more loudiy
D. more slowly
( ) 26. —Do you know Mr Smith well?
—Sure, We ______ friends since ten years ago.
A. were
B. became
C. have made
D. have been
( ) 27. You will fail your next test _____ you start to work hard at your studies now.
A. because
B. unless
C. so
D. why
( ) 28. You should do your homework _____ you can, Jack..
A. as careful as
B. as carefully as
C. as more careful as
D. careful as
( ) 29. I don’t know what to do. Could you please give me _________?
A. some advises
B. any advices
C. some advise
D. any advise
( ) 30. —Do you know if they ____ to play volleyball with us?
—I think they will come if it ______ tomorrow.
A. come, will come
B. will come, will be
C. will come, are
D. come , are
三、阅读理解（每小题2分，共40分）
根据短文内容，选择最佳答案。
(A)
A friend of mine was fond of drawing horse. He drew the horses very well,but he always began the tail. Now it is the Western rule to begin at the head of the horse, that is why I was surprised. It struck me that it could not really make any difference whether the artist begins at the head or the
tail or the belly（肚子）or the foot of the horse, if he really knows his business. And most great artists who really know their business do not follow other people’s rule.They make their own rules. Every one of them does his work in a way peculiar(奇特的) to himself; and the peculiarity means only that he finds it more easy to work in that way. Now the very same thing is true to literature(文学). And the question, "How shall I begin?" only means that you want to begin at the head instead of beginning at the tail or somewhere else. That is, you are not yet experienced(有经验的) enough to trust to your own powers. When you become more experienced you will never ask the question, and I think that you will often begin at the tail --that is to say, you will write the end of the story before you have even thought of the beginning.
31. A friend of the writer’s drew the horses ____.
A. very well
B. in the way of western rule
C. in the way of his own rule
D. all of the above
32. The writer was surprised because ____.
A. the artist began to draw at the head of the horse
B. the artist began to draw at the tail of the horse
C. the artist made his own rule
D. the artist did not follow other people’s rule
33. You are not yet experienced because ____.
A. you don’t know where to begin
B. you want to begin at the head instead of beginning at the tail
C. you always asked question
D. you do not trust to your own powers
34. When you become more experienced you will ____.
A. never ask question
B. often begin at the tail
C. should write the end of the story
D. should think of the beginning
35. The topic of the passage is ______.
A. How to draw a horse
B. How to write a story
C. How to make your own rules
D. Trust to your own powers
(B)
The brain is the boss of the body．Your eyes，ears，nose，and skin tell your brain what is going on around you．Other parts of your body tell your brain what is going on inside of you．Your brain takes in the signals．It tells your body what to do with them．When you touch fire，your skin tells your brain that your finger is too hot．Your brain tells you to move your finger．All these happen very fast．Your brain also controls your breathing，blinking(眨眼)，and heartbeat．It controls your feelings and thoughts too．
Human shave the most developed brain of all animals．Yet it is not the largest brain．The human brain weighs three pounds．The brain of an elephant weighs 11 pounds．So the largest brain is not always the best brain．In people，a larger brain does not mean a clever person．
36 ．What is the main idea of this story?
A．The human brain works very fast．
B．The largest brain is not always the best brain．
C．The brain controls the body．
D．The best brain is the largest brain．
37．What happens after the brain takes in the signals from the body?
A．The brain grows faster and larger．
B．The brain tells the body what to do．
C．The body becomes more developed．
D．We don't know．
38．What does “the boss of the body”mean?
A．The signals．
B．The most developed body part．
C．The main part of the body.
D．The centre I centre of the body．
39．Which brain is the most developed?
A．The largest brain．B．The human brain．
C．The smaller brain．D．Not too big brain．
40．What are the things that the human brain does?
A．Takes in signals．B．Controls breathing．
C．Controls feelings and thoughts．D．A，B and C．
( C )
Dear Boris,
Thanks for your nice letter.
After I had spent a week with my English family, I slowly began to understand their English
a little better. It’s very different from what I learned at school! Students in my group are from different cities of Britain and their dialects (方言) are different too! Some of their accents (口音) are quite strong and they also have their own words and expressions.
But it’s not the language that’s different and surprising. Before I came to England I had thought that fish and chips were eaten every day. That’s quite wrong! I get rather mad now when I hear all the foolish words about typical (典型的) English food.
I had expected to see “London fog”. Do you remember our texts about it? We had no idea that most of this ‘thick fog’disappeared many years ago when people stopped using coal in their homes. But the idea to speak about the weather was very helpful. The weather in London is really changeable.
On the other hand habits are different. People tell me what is typically British here in London is not always typical in Wales or Scotland. Local habits and traditions are not the same as what we knew.
But what is ordinary for all British is that they follow traditions. Probably Britain has more living signs of its past than many other countries. And people have always been proud of having ancient buildings in capitals, big cities and the countryside.
I will tell you more about Britain in my other letters.
Love from Britain,
Pete
41. What does Pete feel about the English language?
A. At first it was difficult for him to understand people.
B. He can understand different dialects and accents.
C. He can speak English better than others.
D. People can’t understand his English.
42. Typical English food _______.
A. makes people mad
B. can’t be seen now
C. is always fish and chips
D. is not what he knew
43. The British people like to talk about weather because ________.
A. there is thick fog in London
B. they like the weather in Britain
C. the weather changes a lot
D. it can be helpful
44. What do you know about habits in Britain from the passage?
A. They are not the same in different parts of Britain.
B. Habits in Wales and Scotland are typically British.
C. There are no typical British habits in Britain.
D. All that is typically British is in London.
45. Which is NOT true according to the passage?
A. What he’s seen is quite different from what he’d learned
B. British people like to follow traditions.
C. Pete had learned about Britain b
D. Pete doesn’t like his life in Britain.
D
Mr Robinson worked in Africa(非洲). His son was born there. His name was John. One winter Mr and Mrs Robinson went England, and they took John there. John was seven years old then.
One day it snowed. The boy went into the garden, and he played in the snow.
He said, "Snow is very beautiful, but it is very cold."
Then he said, "What is this? It is a big, round piece of glass. It is beautiful,
buf it is very cold, too."
But it was not glass. It was ice. It was on a bucket(桶) of water.
John said, "Who put this glass here? I am going to take it into the house."
He took the ice to his father and said, "This is a beautiful piece of glass,
but it is very cold and wet. It was on a bucket of water in the garden."
Mr Robinson smiled and said, "Take it to the kitchen(厨房), put it in front
of the stove(炉子) there, and dry(弄干) it."
The boy took the ice to the kitchen and put it in front of the stove.
He dried(弄干) his hands, because they were very cold and wet, and then he
went to the ice again.
He looked at it, and then he took it to his father again. He said, "I put
this glass in front of the stove, but it does not get drier. It becomes wetter
and smaller."
46. John didn't know what the ice was, because ____.
A. he was very foolish
B. he was young
C. he was born in Africa
D. he didn't go to school
47. One winter Mr and Mrs Robinson went England with ____.
A. their son
B. a boy of their friends
C. their daughter
D. one of their friend's son
48. One day John found ____ on a bucket of water.
A. a piece of glass
B. a pece of ice
C. some snow
D. some water
49. What did Mr Robinson ask John to do?
A. He asked John to take the ice out.
B. He asked John to put the ice in front of the stove.
C. He asked John not to play with ice.
D. He asked John to dry his hands at once.
50. After John put the ice in front of the stove, he found that it became ____.
A. dry
B. wetter
C. bigger
D. colder
第二卷
三：听力填表，录音中有一篇短文，听短文两遍后，根据所听内容完成下面的表格。（5分）
四：任务型阅读：(10分)
On December, 2002, China won the chance to host Expo 2010.Shanghai was host the 2010 World Expo. The World Expo has a long history but it has never been held in Asia. So the 2010 World Expo is an honor for all of the Asians. Our government has promised that it will be the best one. And Shanghai, as a host city, will have more chances to develop quickly. As a student in China, we should learn English well so that we can be volunteers in the Expo to help foreigners know more about Shanghai. Expo 2010 was held from May 1, 2010 to October 31，2010，lasting 184 days.More than 200 courtiers and international organizations came Expo 2010, there were 70 million visitors. Green Cities Visitors traveled through four UK's capital cities from west to east - Belfast, Cardiff, London and Edinburgh. Large "green maps" of the cities were on display. The best way to show how green British cities really are is to "erase" all the buildings and streets, leaving only the green spaces.
阅读短文回答问题：
任务一：根据短文内容，用所给动词的适当形式填空。
1. On December, 2002, China _______( win) the chance to host Expo 2010.
2. we __________ ( learn) English well so that we can be volunteers in the Expo ________ (help) foreigners know more about Shanghai.
任务二：根据据自己所给的汉语意思翻译短语。
3. The World Expo has _____________ (悠久的历史) a long history but it has never been held in Asia.
4.______( 多余)200 courtiers and international organizations came Expo 2010,
There were 70 million visitors.
任务三: 将划线的句子翻译成汉语。
5. __________________________________________.
五：用所给动词的适当形式填空。（10分）
One day a lady saw a mouse ___________(run) across her kitchen floor when she _______(cook). She was very afraid of mice, so she ran out of the house, got on a bus and __________(go)down to the shops. There she spent 10 dollars _________(buy) a mouse-trap. The shopkeeper said to her, “Put some cheese on it, then you __________(catch) that mouse soon.”
The lady went home with the mouse-trap, but when she looked in her cupboard, any cheese couldn’t ________ (find) in it. She didn’t want ______(go) back to the shop because it was too late, so she cut a picture of some cheese out of a magazine and _______(put) that in the trap.
To her surprise, the picture of the cheese _________(be) quite successful! When the lady came down the kitchen the next morning, she found there was a picture of a mouse which _________(put) in the trap beside the picture of the cheese!
六：阅读短文，根据短文内容及首字母填词（10分）
Mr. Smith worked in a company. He had neither a wife nor a child. And he lived in an old house a ______. He liked nothing but drinking. He almost spent all of his money on drinks.
One evening, Mr. Smith met a friend of h______in the street. The man asked him to have dinner in a restaurant. He was happy and d _____ a lot. When they finished the meal, Mr. Smith could hardly walk. His friend had to s _____a taxi and asked the driver to take him home.
Soon the taxi a____ at the door of his house. With the help of the driver, he got out.
“Thank you, sir,” said Mr Smith. “And I can open the door by m ____.”
The taxi driver then went a______. But Mr. Smith couldn’t put the key into the keyhole. He tried many times, but f ______. At that time, a policeman passed there.
“Can I help you o______ the door, sir?” asked the policeman.
“Thank you, sir,” said Mr. Smith. “My house is circling now. If you can stop it from m_______, I can open the door by myse lf.”
九、书面表达（共20分）
我们一直在说全球正在日益变暖，但是2009年我们的气候却和专家所说的相反，这一年是出现了近几年来最冷的温度最大的风雪，这是不是意味着全球并没有在变暖呢？如果你这么想那么你错了，2009年的气候也是全球变暖的另外一种表现，我们的整个地球由于人类的污染正面临着许多的问题？那么作为青少年我们下一步应该怎样做呢？写一篇不少于80词的短文。
要求: 书写规范、语句通顺、语法正确
_______________________________________________________________________________ _______________________________________________________________________________
_______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________
八年级下学期检测题（一）参考答案
听力材料及答案
一、
1.What’s the date today?
2.Did they have a good time on Sunday?
3.My watch is broken. Could you mend it for me?
4.I’m sorry, I have broken your glasses.
5.How often do you go to the cinema?
6.Happy New Year!
7.Hello, may I speak to Tom?
8.Is he a teacher or a student?
9.Did he stay at home yesterday?
10.My father is ill in hospital.
二、
11. M: Would you please hurry up? The film starts at 7:30.
W: We still have half an hour to get there.
12.M: What do you have for breakfast?
W: I used to have rice and eggs, but now I only have coffee and bread.
13. M: Mum, here is my report.
W: You did well in math, physics and chemistry. But you are not good at English and history.
M: I will work hard at them next term.
14. W: What can I do for you?
M: I want to buy some bananas. How much are they?
W: Five yuan per kilo.
M: Three kilos please.
15. W: It wasn’t easy to win the match. NO.4 Middle School is really a strong team.
M: But your team is even stronger. I knew you would beat them because you played so well in the league match.
三、
W: Good morning. Can I help you?
M: Yes, please. I’d like to buy a mobile phone.
W: What kind do you like , Motorola, Nokia or TCL?
M: I have no idea. Which kind is sold best?
W: Motorola is more popular. You can buy one if you like.
M: How much is a Motorola?
W: The old type is cheaper and the new type is expensive. You can have this one. It looks nice and works well, and it’s not expensive.
M: How much is it?
W: 1800 yuan. If you choose a number, you need to pay another 200 yuan.
M: OK. I’ll take this one. Thank you for your help.
W: It’s a pleasure.
四、
Last Sunday Mr. White and his wife went to the farm. They got home very late. Mr.
White opened the front door and they went into the house. It was very dark, so Mr. White turned on the lights. On the way upstairs, Mrs. White said , “ Listen. I can hear someone in the bedroom.” They went downstairs again and stood quietly outside the room.
“ Yes, you’re right,” said Mr. White. “ There are two boys there. They are talking!”
Then he called out, “ Who is there ?” But nobody answered. Mr. White opened the door and quickly turned on the light. The room was empty, and then he saw something and laughed . The radio was still on. “ Oh, dear!” he said , “I forgot to turn off the radio this morning.”
五、
My aunt works in Beijing. I visited her during last summer vacation. Beijing is a beautiful city. A lot of foreigners go sightseeing there. My aunt and I got up early on Saturday morning and we went to the Great Wall by car. We returned to the center of the city at four and visited the Palace Museum. The next morning we went to the Summer Palace by bike. That afternoon, we rode a bus to Beihai Park. We were tired, but I think we had a good time there.
答案：
听力：一：1—5 CBAAA 6—10 CBCCB
二：11—15 CABBA
三: 16—20 CABCA
四：21—25 BACAB
The Great Wall The Palace Museum Bike Beijing Zoo Bus
笔试一：1-5. BACDA 6-10. BBABD 11-15. ACABA 16- 20: DAABC 21- 25: CADCD 26- 30: DBBCC
二：31-35. :CDDCD 36—40. CBDBD 41---45. ADCAD 46---50：CABBB
三：The Great Wall The Palace Museum Bike Beijing Zoo Bus
四：1. won 2.. should learn, to help 3. a long history 4. More than / Over 5. 2010 世博会从2010年五月一号开始到十月三十一号，持续184天。
五．1. running 2. was cooking 3. went 4. buying 5. can catch 6. be found 7. to go 8. put 9. was 10. was put
六：1 . alone 2. his 3. drank 4. stop 5. arrived 6. myself 7. away
8. failed 9. open 10. moving
九: Taking care of our environment is our duty. But how we can do to make our environment more beautiful?
At first,we must make ourselves clean. For example,we must wash our clothes when they are dirty. We should not litter waste things about, and draw on the wall. We mustn't spit in public or cut down trees. We should plant more trees around our neighbourhood. We should pick the rubbish up and throw them into the dustbin when we see them.
We must make our world more and more beautiful, don't you think so?
名师测控数学八年级下册卷子2019 一、填空。 1、学校有一条长20米的道路，计划在道路两旁栽树，每隔2米栽一棵。 (1)如果两端都栽，那么需要()棵树苗。 (2)如果两端都不栽，那么需要()棵树苗。 (3)如果只有一端栽树，那么需要()棵树苗。 2、小明把9颗贝壳放在地上摆成一行，每两颗之间的距离是3厘米，第一颗到第9颗的距离是()厘米。 3、有一个正方形的花坛，边长是12米，在四个角上栽了4棵迎春花。如果在迎春花之间每隔2米栽一棵月季花，共要栽月季花()棵。 4、在一个正方形的操场四周每边栽12棵树，最多栽()棵，最少栽()棵。 5、为了保护公园一棵千年古树，园林所决定为它做一圈圆形的防护栏，如果安排10个间隔，一共需要()根木桩。 6、小方每上一层楼需要50秒，那么从一楼到六楼需要()秒。 7、圆形鱼池周长180米，要在它周围种柳数，每隔6米栽一棵，一共要种()棵。 8、36个学生在操场上围成一个圆圈做游戏，每相邻两个同学之间都是2米，这个圆圈的周长是()米。
二、列式计算。 1、一条走廊长24米，每隔3米放一盆花，走廊两端都要放。一共要放多少盆花? 答：一共要放盆花。 2、在一条河堤的一边栽75棵柳树。每两棵柳树中间栽一棵芙蓉树，栽芙蓉树多少棵? 答：栽芙蓉树棵。 3、把一根木料锯成30厘米长的小段，一共花了10分钟。已知锯下一段要花1分钟，这根木料有多长? 答：这根木料长厘米。 4、一座宿舍的走廊长15米，插有6面彩旗(两端都有)。照这样计算，办公大楼走廊长27米，要插多少面彩旗? 答：要插面彩旗。 5、一根木料锯成3段要8分钟。如果每锯一段所用的时间相同，那么锯成7段需要花多少分钟? 答：锯成7段需要分钟。 6、要在正方形的喷水池边上摆上花盆，每一边摆放7盆花(四个角上都要有一盆花)，一共要摆多少盆花? 答：一共要摆盆花。 7、四年级共选49位同学参加校运会开幕式，他们排成一个方阵人场。这个方阵的最外层一共有多少人? 答：最外一层一共有人。
第10章 分式 单元自测卷 （满分：100分 时间：90分钟） 一、选择题（每题3分，共30分） 1．下列各式：11,,,1,,52235a n a a b y m b x π++-其中分式有 ( ) A ．2个 B ．3个 C ．4个 D ．5个 2．把分式3xy x y -中的x 和y 都扩大2倍，则分式的值 ( ) A ．不变 B ．扩大为原来的2倍 C ．缩小为原来的 D ．扩大为原来的4倍 3．(2013．云南)要使分式2939 x x -+的值为0，你认为x 可取的数是 ( ) A ．9 B ．±3 C ．－3 D ．3 4．（2014．杭州）若241()142w a a +=--g ，则w=（ ） A.2(2)a a +≠- B. 2(2)a a -+≠ C. 2(2)a a -≠ D. 2(2)a a --≠- 5．（2014．南通）化简 的结果是（ ） A ． x +1 B ． x ﹣1 C ． ﹣x D ． x 6．下列计算错误的是 ( ) A ．0.220.77a b a b a b a b ++=-- B ．3223x y x x y y = C ．1a b b a -=-- D ．1 23c c c += 7．（2014．孝感）分式方程 2133x x x =--的解为 ( ) A ．x ＝－16 B ．x ＝ 23 C ．x ＝1 D ．x ＝56 8．关于x 的方程12n m x x +--=0可能产生的增根是 ( ) A ．x ＝1 B ．x ＝2 C ．x ＝1或2 D ．x ＝－1或2 9．若()() 412121a m n a a a a -=++-+-，则 ( ) A ．m ＝4，n ＝－1 B ．m ＝5，n ＝－1 C ．m ＝3，n ＝1 D ．m ＝4，n ＝1 10．(2014．贺州)张华在一次数学活动中，利用“在面积一定的矩形中，正方形的周长最短”
八年级下学期数学测试卷 一、选择题： 1.如果代数式有意义，那么x的取值范围是（） A．x≥0 B．x≠1 C．x＞0 D．x≥0且x≠1 2. 下列各组数中，以a、b、c为边的三角形不是直角三角形的是（） A 1.5,2,3 a b c === B 7,24,25 a b c === C 6,8,10 a b c === D 3,4,5 a b c === 3.如图，直线l上有三个正方形a b c ，，，若a c ，的面积分别为5和11，则b的面积为（） Ａ．4 Ｂ．6 C．16 Ｄ．55 4. 如图，在平行四边形ABCD中，下列结论中错误的是（） A．∠1=∠2B．∠BAD=∠BCD C．A B=CD D．A C⊥BD 5. 如图，在平行四边形ABCD中，对角线AC，BD相交于点O，点E，F分别是边AD，AB的中点，EF交AC于点H ，则的值为（） A．1B．C．D．6.0) y kx b k =+≠ （的图象如图所示，当0 y>时，x的取值范围是 （） A.0 x< B.0 x> C.2 x< D.2 x> 7. 体育课上，20人一组进行足球比赛，每人射点球5次，已知某一组的进球总数为49个，进球情况记录如下表，其中进2个球的有x人，进3个球的有y人， 进球数0 1 2 3 4 5 人数 1 5 x y 3 2 A.y=x+9与y= 3 x+ 3 B.y=－x+9与y= 3 x+ 3 C.y=－x+9与y=－ 2 3 x+ 22 3 D.y=x+9与y=－ 2 3 x+ 22 3 8. 已知一次函数y=kx+b（k、b为常数且k≠0）的图象经过点A（0，﹣2）和点B（1，0），则k=，b= 9.已知:ΔABC中,AB=4,AC=3,BC=7,则ΔABC的面积是( ) A.6 B.5 C.1.57 D.27 10. 如图，已知一条直线经过点A（0，2）、点B（1，0），将这条直线向左平移与x轴、y 轴分别交与点C、点D．若DB=DC，则直线CD的函数解析式为． a b c
八年级语文暑假作业答案2020 八年级语文暑假作业答案2018 P1： 凡事要从实际出发，读书亦然，不要只钻书本，要从实践中获得真知。 P2： 1.写了人的五种感受 2.原因之一一部分人的共感觉能力逐渐遭 到部分以至甚至是全部破坏，混合感觉都被过滤掉了，只剩下一种 起主导作用的感觉；原因之二，也有可能是他们的共感觉能力实际 上是存在的，但由于这种能力不是很强烈，因而没有感觉到这种共 感觉能力。3.为了说明只要想着去做一件事，无论什么困难都阻止 不了 P6： 1.明显 2.显示 3.显示 4.显达 5.施行 6.分布 7.排列 8.交界 9.结识10.交换11.交情12.交错13.成功14.成全15.成为16.成果 P8： 1.是花的主人，与花相亲相融 2.反衬，用我们“为之绝倒发痴”（或“为花而目醉神迷、惊愕叹息”），反衬山村农妇“视而不见”（或：不为所动） 3.略 4.没有游离主题，叙述少年看落霞落日，是为了引出老尼面对晚霞落日的态度，用以衬托农妇对桐花的态度。说明这些融入自然造 化的人，心理是一样的，这种写法正是散文“形散”的特点体现。5.第一处的作用是引起下文的议论，第二处的作用是收束全文，同时 呼应第一处。
衣冠楚楚神采奕奕忠心耿耿虎视眈眈铁骨铮铮相貌平平天网恢恢气喘吁吁战功累累顾虑重重得意洋洋兴致勃勃气势汹汹羞人答答无 所事事威风凛凛小心翼翼气息奄奄想入非非目光炯炯余音袅袅芳草 萋萋忧心忡忡温情脉脉茫茫沧海 巍巍高山欣欣向荣蒸蒸日上 P14： 1.“常记”或“记”。 2.“时间”为落日时分；“节令”为莲花盛开的日子。可以有不同表述，意对即可。 3.示例：那天的云彩一定有着格外的光晕。符合原词意境、句式结构相近即可。 4.“兴尽晚回舟”。 5.示例1：生当作人杰，死亦为鬼雄。示例2：只恐双溪舴艋舟，载不动许多愁。 P15： 漫画写了两个小孩在军训，而奶奶怕他们晒坏。老远给他们撑遮阳伞。说明乐现在的家长普遍溺爱孩子，“军训”概括了漫画内容，“小祖宗”揭示乐长辈对孩子溺爱，具有讽刺意义。 “男士”不是称呼用语，不用来叫别人，跟“女士”相对的是“先生”，当然，“先生”也跟“小姐”对。 P17： 小女孩并没有开错窗，只是两次开窗，她的视点落在了不同的事物上，所以，“生活中如果我们过于关注丑陋、悲伤的事情会让我 们悲观消极，而美好的事情会让我们心境开朗；但如果我们不关心 丑陋、悲伤的事，则会让我们缺乏生活经验。难以明辨是非。”是 非常有哲理的。
分式的化简求值专项训练 化简求值： 1．先化简，然后a在﹣1、1、2三个数中任选一个合适的数代入求值． 2．先化简，再求值：，其中a=2013． 3．先化简，再求值：，其中，a=1+，b=1﹣． 4．先化简，然后从1、、﹣1中选取一个你认为合适的数作为a的值代入求值． 5．先化简，再求值：，其中，． 6．先化简，再求值：（﹣）÷，其中m=﹣3，n=5． 7．先化简，再求值：÷（﹣a﹣2b）﹣，其中a，b满足． 8．先化简，再求值：，其中x是不等式3x+7＞1的负整数解．
9．先化简，再求值：a﹣2+，其中a=3． 10．先化简，再求值：（+）÷，其中x=2． 11．先化简，再求值：，其中a=． 12．先化简，再求值：，其中x=﹣2． 13．先化简，后求值：，其中a=3． 14．先简化，再求值：，其中x=． 15．先化简，再求值：，其中x=2． 16．先化简：（﹣x+1）÷，然后从﹣1≤x≤2中选一个合适的整数作为x的值代入求值． 17．先化简，再求值：，其中x=3．
18．先化简，再求值：÷（a﹣），其中a、b满足式子|a﹣2|+（b﹣）2=0．19．先化简，再求值：（﹣）÷，其中x=4． 20．先化简，再求值：，其中a=﹣1．
参考答案与试题解析 一．解答题（共20小题） 1．（2013?巴中）先化简，然后a在﹣1、1、2三个数中任选 一个合适的数代入求值． 考点：分式的化简求值． 专题：压轴题． 分析：先根据分式混合运算的法则把原式进行化简，再选取合适的a的值代入进行计算即可．解答： 解：原式=×+ =+ =， 当a=2时，原式==5． 点评：本题考查的是分式的混合运算，再选取a的值时要保证分式有意义．2．（2013?普洱）先化简，再求值：，其中a=2013． 考点：分式的化简求值． 专题：计算题． 分析：原式第一项利用除法法则变形，约分后利用同分母分式的减法法则计算得到最简结果，将a的值代入计算即可求出值． 解答： 解：原式=?﹣=﹣=， 当a=2013，原式==． 点评：此题考查了分式的化简求值，熟练掌握运算法则是解本题的关键． 3．（2013?襄阳）先化简，再求值：，其中，a=1+，b=1﹣． 考点：分式的化简求值． 分析：先根据分式混合运算的法则把原式进行化简，再把a、b的值代入进行计算即可
一、选择题 1．已知：△ABC 中，BD 、CE 分别是AC 、AB 边上的高，BQ ＝AC ，点F 在CE 的延长线上，CF ＝AB ，下列结论错误的是（ ）． A ．AF ⊥AQ B ．AF=AQ C ．AF=AD D ．F BAQ ∠=∠ 2．如图，在矩形纸片ABCD 中，AD ＝9，AB ＝3，将其折叠，使点D 与点B 重合，折痕为EF ，那么折痕EF 的长为（ ） A ．3 B ．6 C ．10 D ．9 3．如图，等边ABC ?的边长为1cm ，D ，E 分别是AB ，AC 上的两点，将ADE ?沿直线DE 折叠，点A 落在点'A 处，且点'A 在ABC ?外部，则阴影部分图形的周长为（ ） A ．1cm B ．1.5cm C ．2cm D ．3cm 4．如图，菱形ABCD 的对角线AC ，BD 的长分别为6cm ，8cm ，则这个菱形的周长为 （ ） A ．5cm B ．10cm C ．14cm D ．20cm 5．在ABC 中，90C ∠=?，30A ∠=?，12AB =，则AC =（ ）
A ．6 B ．12 C ．62 D ．63 6．如图，△ABC 中，AB=10，BC=12，AC=213，则△ABC 的面积是（ ）． A ．36 B ．1013 C ．60 D ．1213 7．如图，分别以直角ABC ?三边为边向外作三个正方形，其面积分别用123,,S S S 表示，若27S =，32S =，那么1 S =（ ） A ．9 B ．5 C ．53 D ．45 8．在直角三角形ABC 中，90C ∠=?，两直角边长及斜边上的高分别为,,a b h ，则下列关系式成立的是（ ） A ． 222 221a b h += B ． 222 111a b h += C ．2h ab = D ．222h a b =+ 9．由下列条件不能判定△ABC 为直角三角形的是（ ） A ．∠A+∠B=∠C B ．∠A ：∠B ：∠C=1：3：2 C ．a=2，b=3，c=4 D ．(b+c)(b-c)=a2 10．如图，△ABC 中，AB ＝AC ，AD 是∠BAC 的平分线．已知AB ＝5，AD ＝3，则BC 的长 为（ ） A ．5 B ．6 C ．8 D ．10 二、填空题
八年级（下）期中数学试卷 一、选择题（每题3分，共45分） 1．（3分）若二次根式有意义，则x的取值范围为（） A．x≥2 B．x≠2 C．x＞2 D．x≥0 2．（3分）下列二次根式中，不能与合并的是（） A．B．C．D． 3．（3分）下列各式中属于最简二次根式的是（） A．B． C．D． 4．（3分）若，则（） A．b＞3 B．b＜3 C．b≥3 D．b≤3 5．（3分）下列各组线段中，能够组成直角三角形的是（） A．6，7，8 B．5，6，7 C．4，5，6 D．3，4，5 6．（3分）下列命题的逆命题是正确的是（） A．若a=b，则a2=b2B．若a＞0，b＞0，则ab＞0 C．等边三角形是锐角三角形D．全等三角形的对应边相等 7．（3分）如图，在Rt△ABC中，∠C=90°，∠A=30°，BC=2，则AB=（） A．4 B．C．D． 8．（3分）一个四边形的三个相邻内角度数依次如下，那么其中是平行四边形的是（）A．88°，108°，88°B．88°，104°，108° C．88°，92°，92° D．88°，92°，88° 9．（3分）如图，在四边形ABCD中，对角线AC、BD相交于点O，下列条件不能判定四边形ABCD为平行四边形的是（） A．AB∥CD，AD∥BC B．OA=OC，OB=OD C．AD=BC，AB∥CD D．AB=CD，AD=BC 10．（3分）八年级（3）班同学要在广场上布置一个矩形的花坛，计划用红花摆成两条对角线．如果一条对角线用了49盆红花，还需要从花房运来红花（） A．48盆B．49盆C．50盆D．.51盆 11．（3分）若一直角三角形的两边为5和12，则它第三边的长为（） A．13 B．C．13或D．13或 12．（3分）平行四边形ABCD中，AB=1，BC=，AC=2，则连接四边形ABCD四边中点所成的
课题 函数的图象(1) 【学习目标】 1．让学生掌握用描点法画出一些简单函数的图象． 2．让学生理解表达式法和图象法表示函数关系的相互转换． 【学习重点】 函数与图象的关系． 【学习难点】 表达式法和图象法表示函数关系的相互转换． 行为提示：创设问题情景导入，激发学生的求知欲望． 行为提示：让学生阅读教材，尝试完成“自学互研”的所有内容，并适时给学生提供帮助，大部分学生完成后，进行小组交流． 知识链接： 1．直角坐标系上每一个点的位置都能用一对有序实数表示． 2．S △＝12 ×底×高． 解题思路：根据直角坐标系上每一个点的位置确定图象的趋势，需要多分画几个阶段的图形，可以发现△ADP 的面积的变化如何． 方法指导：确定选哪一个函数图象时，一般采用分画图形进行．情景导入 生成问题 【旧知回顾】 1．如图：怎样从图上找到各个时刻的气温的？ 解：图中的直角坐标系中，它的横轴是t 轴，表示时间；它的纵轴是T 轴，表示气温，这一气温曲线实际上给出了某日的气温T(℃)与时间t(时)的函数关系．例如，上午10时的气温是2 ℃，表现在气温曲线上，就是可以找到这样的对应点，它的坐标是(10，2)，实质上也就是说，当t ＝10时，对应的函数值T ＝2，气温曲线上每一个点的坐标(t ，T)，表示时间为t 时的气温是T. 2．在生活中，你能再举一个这样的例子吗？ 略自学互研 生成能力 知识模块一 函数图象 【自主探究】 1．一般来说，函数的图象是由直角坐标系中一系列的点组成的图形．图象上每一点的坐标(x ，y)代表了函数的一对对应值．它的横坐标x 表示自变量的某一个值，纵坐标y 表示与该自变量对应的函数值． 2．确定某一变化的函数图象时，一般应看每一时刻自变量对应的函数值发生了什么变化，由变化趋势再来确定与哪一个图象类似．
八年级语文暑假作业答案 一、基础知识积累与运用(共26分) 1、下列词语中加点字注音完全正确的一项是：()(2分) A匿名(nuò)诘责(jié)虬枝(qiú)杳无消息(yǎo) B禀赋(bǐng)芦荟(huì)不逊(xùn)广袤无垠(máo) C蹴尔(cù)锃亮(chèn)移徙(xí)锲而不舍(qiè) D炽热(chì)绮户(qǐ)颠簸(bǒ)数见不鲜(shuò) 2、下列词语中书写完全正确的一项是()(2分) A恹恹锤练潜滋暗长粗制烂造 B淅沥攀缘纵横绝荡偃苗助长 C澎湃流连猗郁浮想连翩 D狡黠共勉湛蓝正襟危坐 A.妈妈在抽屉里翻来覆去好几遍，可还是没有找到自己的身份证。 B.炮轰食品犯罪行为，维护百姓餐桌安全，是时代赋予新闻工作者义不容辞的责任。 C.我，一个芸芸众生，虽没有显赫的家庭背景，但我有一双巧手和一颗不服输的心。 D.面对公安机关的审问，这个犯罪分子刚毅不屈，拒不承认自己入室抢劫的罪行。 4.下列句子没有语病的一项是()(2分) B.学生写作文切忌不要胡编乱造。 C.我们应该从小培养诚实守信的美德。
D.如果人们连续看四五个小时的电视节目，就会感到十分疲劳。 5.为下面这则消息拟写的标题最恰当的一项是()(2分) 本届绿博会与往届相比有三大特点：组团参展省市数量明显增多;采购商层次明显提高;首次举行中国绿色食品博览会网上交易会。 第四届绿博会“绿色、生态、发展”为主题 第四届绿博会开幕 第四届绿博会有三大特点 第四届绿博会绿博会规模空前 6.根据语境，下列排序最恰当的一项是()(2分) 我爱小池，也爱溪流，是因为它们的“清”和“远”。，像—位活泼的姑娘，唱着欢快的歌儿，踏着轻快的脚步，走出群山去迎接 太阳和大海。 ①各种颜色的小鱼穿行其间，历历可数②溪流蜿蜒，如一条银蛇 ③小池清澈见底，汪汪一碧，宛如一块温润的碧玉④时隐时现，游向远方 ⑤绿油油的水草在水底轻轻晃动 ③⑤①②④B.②④⑤③①C.②④①③⑤D.③①⑤④② 7.下面这个句子出自纪伯伦的《雨之歌》，其中的“我”是诗人描写的“雨”。请你仿照这种句式，写一段话，并注明你所描写的 对象。(2分) 我哭，山河却在欢乐;我掉落下来，花草却昂起了头，挺起了腰，绽开了笑脸。 我描写的对象是 8.综合探究。(4分)
八年级数学第二学期期末检测 第I 卷（选择题） 一、选择题：（本大题共15个小题．每小题3分，共45分。在每小题给出的四个选项 中，只有一项是符合题目要求的，把正确的选择填在答题卡中。） 1.若a －b ＜0，则下列各式中一定正确的是 （ ） A.a ＞b B.－a ＞－b C.b a ＜0 D.ab ＞0 2.下列从左到右的变形是因式分解的是（ ） A.(x －4)(x +4)=x 2－16 B.x 2－y 2+2=(x +y )(x －y )+2 C.x 2+1=x(x+x 1 ) D.a 2b+ab 2=ab(a+b) 3.下列方程中，是一元二次方程的是( ) A.x=2y-3 B.2(x+1)=3 C.x 2+3x-1=x 2+1 D.x 2=9x-1 4.下列美丽的图案，既是轴对称图形又是中心对称图形的个数是 （ ） A.1个 B.2个 C.3个 D.4个 5.如图，点A 、B 、C 、D 都在方格纸的格点上，若△AOB 绕点O 按逆时针方向旋转到 △COD 的位置，则旋转的角度为（ ） A.30° B.45° C.90° D.135° 6.下列说法正确的是 （ ） A.平移不改变图形的形状和大小，而旋转则改变图形的形状和大小 B.平移和旋转的共同点是改变了图形的位置，而图形的形状大小没有变化 C.图形可以向某方向平移一定距离，也可以向某方向旋转一定距离 D.在平移和旋转图形中，对应角相等，对应线段相等且平行 7.在下列式子2y x -，a 3，11--m m ，πx ，23 y y ，31中，分式的个数是（ ）. A.2个 B.3个 C.4个 D.5个 5题图
八年级下语文测试三 长春六十九中学李金贤 一、给加点字注音，根据拼音填汉字。 脂粉奁．稽．首旸．谷酷肖．相形见绌． 咫．尺蓬hāo fěi翠千山万hè美味佳yáo 二、古诗文名句默写 1、《马说》中阐明千里马被埋没的根本原因是：。 2、人们常引用韩愈《马说》中的句子：“，。，。”来说明：人才需要有人来发现和培养，发现人才的人很重要，比人才更难得。 3、2005年的连宋大陆之行，是历史的发展趋势，顺应了民意，打破了僵局，开启了两岸交流的新纪元。这下像刘禹锡《酬乐天扬州初逢席上见赠》诗中所说：“，。” 4、《山坡羊潼关怀古》中以动写静的句子是, 。 5、《过零丁洋》中，概括写出诗人被捕前的全部经历的诗句是______________________，______________________；概括写出两次抗元，遭受失败后的的心情的诗句是 _____________________，______________________。 三、文言文阅读 （一）五柳先生传(陶渊明) 先生不知何许人也，亦不详其姓字。宅边有五柳树，因以为号焉。闲静少言，不慕荣利。好读书，不求甚解；每有会意，便欣然忘食。性嗜酒，家贫不能常得。亲旧知其如此，或置酒而招之；造饮辄尽，期在必醉。既醉而退，曾不吝情去留。环堵萧然，不蔽风日；短褐穿结，草瓢屡空，晏如也。常著文章自娱，颇示己志。忘怀得失，以此自终。 赞日：黔娄之妻有言：“不戚戚于贫贱，不汲汲于富贵。”其言兹若人之俦乎，衔觞赋诗．以乐其志。无怀氏之民欤?葛天氏之民欤? 1、解释下列语句中加点的词语。 (1)亦不详．其姓字( ) (2)每有会．意( ) (3)期．在必醉( ) (4)其言兹若人之俦．乎( ) 2、翻译下列文言语句。 不戚戚于贫贱，不汲汲于富贵。 3、文章结尾提到“无怀氏之民”、“葛天氏之民”，表达了作者怎样的愿望? 4、五柳先生有哪三大志趣（用文中原句或词语回答）？刻画了一个怎样的人物形象？ 5、陶渊明通过写五柳先生的“醉”，反映了他自己怎样的内心世界？
2019八年级暑假作业语文答案2019八年级暑假作业语文答案 参考答案： 一、1.mǐn shǔ wǎnɡ y ru sǎn xuān rn zh m yǐ j j zhun rn xū 2.(1)顺着，就着模仿，这里指雕刻 (2)赠 (3)代词，它，指代中轩敞者 (4)语气助词了 (5)举不相类似 (6)平 (7)清楚明白 (8)竟然满 5.(1)有又(2)诎屈(3)衡横 6.(1)张潮虞初新志魏学洢明说明 (2)大苏泛赤壁山高月小水落石出清风徐来水波不兴《赤壁赋》《后赤壁赋》 罔不因势象形，各具情态技亦灵怪矣哉 7.D 8.B 9.B 10.C 11.(1)c (2)b (3)a (4)a (5)c 12.(1)苏东坡、黄鲁直一起观看一轴手卷。 (2)船尾横放着一把桨。
(3)再刻上一枚篆字印章，文字是初平山人，它的颜色是红的。 (4)总计在这一只小船上，刻有五个人物，八扇窗子。 大多数文言文有数词而无量词，现代文则数、量词同用;文言文的数词可放在名词后，现代文的数词习惯于放在名词前。 13.(1)文字少，传播信息量大。如第2段用380多个字，写了船、舱、窗、雕栏、刻字等物。 (2)用语前后照应、互相关联。如船尾与船头关联、照应。楫与居右者居左者照应，左手倚一与右手攀关联，右手执蒲左手抚炉关联，其人与居左者照应。 (3)本文有些段落运用了描写，写出特点，把无生命的核舟描绘得生动、传神。如中峨冠而多髯者写出东坡的外貌特征;右手攀趾，若啸呼状写出舟子的姿态特征。 14.(1)因势利导(2)独具匠心(3)栩栩如生 二、(一)15.魏学洢说明文大苏泛赤壁 16.(1)全都是按照(材料原来的)形状刻成(各种事物的)形象。 (2)(他)曾经赠给我一个桃核刻成的船，刻的应当是苏轼游赤壁的情景。 (3)中间高起而宽敞的部分是船舱。 (4)打开窗子来看，雕刻着花纹的栏杆左右相对。 17.生活时代姓名精湛技艺来历大小格局 18.数字说明(列数字) 写核舟的体积之小，突出雕刻者高超的技艺
最新2018年新人教版八年级数学（下）期末检测试卷 （含答案） 一、选择题（本题共 10小题，满分共30分） 1．二次根式 2 1、12 、30 、x+2 、240x 、22y x +中，最简二次根 式有（ ）个。 A 、1 个 B 、2 个 C 、3 个 D 、4个 2.若式子2x -有意义，则x 的取值范围为（ ）. A 、x≥2 B 、x≠3 C 、x≥2或x≠3 D 、x≥2且x≠3 3．如果下列各组数是三角形的三边，那么不能组成直角三角形的一组数是（ ） A ．7，24，25 B ．1113,4,5 222 C ．3，4， 5 D ． 11 4,7,822 4、在四边形ABCD 中，O 是对角线的交点，能判定这个四边形是正方形的是（ ） （A ）AC=BD ，AB ∥CD ，AB=CD （B ）AD ∥BC ，∠A=∠C （C ）AO=BO=CO=DO ，AC ⊥BD （D ）AO=CO ，BO=DO ，AB=BC 5、如图，在平行四边形ABCD 中，∠B ＝80°，AE 平分∠BAD 交BC 于点E ，CF ∥AE 交 AE 于点F ，则∠1＝（ ） 1 F E D C B A A ．40° B ．50° C ．60° D ．80° 6、表示一次函数y ＝mx +n 与正比例函数y ＝mnx (m 、n 是常数且mn ≠0)图象是（ ） 7.如图所示，函数x y =1和3 4 312+=x y 的图象相交于（－1，1），（2，2）两点．当21y y >时，x 的取值范围是（ ）
A ．x ＜－1 B ．—1＜x ＜2 C ．x ＞2 D ． x ＜－1或x ＞2 8、 在方差公式( )()( )[]2 22212 1 x x x x x x n S n -++-+-=Λ中，下列说法不正确的是 （ ） A. n 是样本的容量 B. n x 是样本个体 C. x 是样本平均数 D. S 是样本方差 9、多多班长统计去年1～8月“书香校园”活动中全班同学的课外阅读数量（单位：本），绘制了如图折线统计图，下列说法正确的是（ ） （A ）极差是47 （B ）众数是42 （C ）中位数是58 （D ）每月阅读数量超过40的有4个月 10、如图，在△ABC 中，AB =3，AC =4，BC =5，P 为边BC 上一动点，PE ⊥AB 于E ，PF ⊥AC 于F ，M 为EF 中点，则AM 的最小值为【 】 A ．54 B ．52 C ．53 D ．65 M P F E C B A
名师测控(春季版)八年级数学下册16二次根式二次根式的乘除1学案新版沪科版 【学习目标】 1、理解＝(a≥0，b≥0)，＝(a≥0，b≥0)，并利用它们进行计算和化简、 2、由具体数据发现规律，导出(a≥0，b≥0)，利用逆向思维得出＝，并利用它们进行计算或化简、 【学习重点】 ＝(a≥0，b≥0)，＝(a≥0，b≥0)及它们的运用、 【学习难点】 发现规律，导出＝(a≥0，b≥0)、行为提示：点燃激情，引发学生思考本节课学什么、行为提示：认真阅读课本，独立完成“自学互研”中的题目，并在练习中发现规律，从猜测到探索到理解知识、解题思路：非负数的积的算术平方根等于积中多因式算术平方根的积、归纳：二次根式相乘，根号不变，把被开方数相乘、情景导入生成问题旧知回顾： 1、什么是二次根式？二次根式有意义的条件是什么？答：形如(a≥0)的式子叫做二次根式、二次根式有意义的条件是被开方数大于等于0、 2、二次根式的性质 1、性质2是什么？答：()2＝a(a≥0)，＝|a|＝自学互研 生成能力
【自主探究】 阅读教材P6～7，完成下列问题：二次根式的乘法公式是怎样的？如何证明？答：二次根式的乘法公式：如果a≥0，b≥0，那么有＝、∵当a≥0，b≥0时，()2＝()2()2＝ab，又()2＝ab，ab 的算术平方根只有一个，所以＝、范例1：计算：(1)＝；(2)＝ 3、仿例1：下列计算正确的是( D ) A、23＝6 B、33＝3 C、42＝8 D、26＝12仿例2：等式＝成立的条件是( A ) A、x≥1 B、x≥－1 C、－1≤x≤1 D、x≥1或x≤－1学习笔记：几个二次根式相乘，被开方数相乘时，可将被开方数分解质因数，然后根据＝(a≥0，b≥0)， 将能开得尽方的因数移到根号外、行为提示：教师结合各组反馈 的疑难问题分配展示任务，各组在展示过程中，老师引导其他组 进行补充、纠错，最后进行总结评分、学习笔记：检测可当堂完成、积的算术平方根的性质是什么？如何得到？答：二次根式性 质3(即二次根式乘法公式)，＝，由等式对称性，性质3也可以写成＝(a≥0，b≥0)、范例2：化简：(1)；(2)；(3)；(4)、解：(1)原式＝＝15；(2)原式＝＝77；(3)原式＝＝7；(4)原式＝＝
初中数学试卷 金戈铁骑整理制作 16.3二次根式的加减 预习目标 1.会将二次根式化成最简二次根式; 2.会用二次根式的加减法则进行计算. 预习过程 (一)活动准备 1.平方差公式:两个数的和与这两个数的差的积,等于这两个数的平方差.即()()b a b a -+=__________. 2.完全平方公式:两数和(或差)的平方,等于它们的平方和,加(或减)它们的积的2倍.即 ()2b a +=_________________,()2b a -=_________________. 3.一个三角形的三边长为252423、、 ,求它的周长. 4.一天晚上夏雨的爸爸和夏雨做了一个游戏,夏雨的爸爸说:“你已经学习了二次根式,若x 表示10的整数部分,y 表示10的小数部分,我这个钱包的钱是()10x y ??+??元,你猜一猜我的钱包的钱是多少?如果猜对了,我这个钱包的钱全给你”.夏雨说：“1元”.你说夏雨能得到爸爸钱包的钱吗? (二)新知学习 1.在有理数范围内成立的运算律,在实数范围内仍然____. 2.二次根式加减时,可以先将二次根式化成____________,再将被开方数____的二次根式进行合并. 3.在二次根式运算中,多项式乘法法则和乘法公式仍然____. 16.3二次根式的加减参考答案 活动准备 1.22b a -. 2.222b ab a ++,.222b ab a +- 3.().2122543252423=++=++ 4.∵3<10<4,∴10的整数部分x =3.∴10的小数部分y =103-. ∴()10x y ??+??=()()()22103103103 1.+-=-= ∴夏雨爸爸钱包的钱是1元.∴夏雨能得到爸爸钱包的钱. 新知学习 1.成立. 2.最简二次根式,相同. 3.适用.
八年级下学期英语期末质量检测试卷 在考试之前，认真的去做一系列的试题卷也是一种高效率的学习方法。对于这种学习方法，你认可吗?让我们来做一做这套试卷吧!现在请欣赏我带来的湖北省咸宁市城关中学。 湖北省咸宁市城关中学 其他 A small town named Bundanoon in Australia has decided to stop the sale of bottled water(瓶装水).The government(政府) says that bottled water can cause(引起) environmental problems. The factories use too many resources(资源)to make bottled water. When people finish drinking the water, they throw the bottles everywhere. So the government asks the native people to stop buying bottled water and use tap water(自来水) to drink. The government also encourages visitors to get water from water stations in the main streets, and fill the water in bottles that can be used again. All the shopkeepers in the town support(支持)the decision. Bundanoon is the worlds first town that has got its shops to stop selling bottled water. Probably we should follow the example. Lets stop buying bottled water and use tap water! Astronauts on board the Shenzhou-10 spacecraft have taught a lesson from space to schoolchildren through a live video. The
2021年八年级语文暑假作业答案 【导语】对初中学生的指导更多的应侧重于学习方法和学习意志品质的培养进入初中以后，学生在学习上的独立性逐步增强。课堂教学中，教师比较注意启发学生独立思考问题;课堂教学外，学生更多的需要自觉地独立安排自己的学习活动。本篇文章是xx为您整理的《2021年八年级语文暑假作业答案》，供大家借鉴。 【篇一】 一、1.C 2①“率”改为“摔”②“陈寂”改为“沉寂”，“拨”改为“拔”③“吊”改为“掉”，“道”改为“到” 3.A. 4.略 5①A②D③C. 6.②④①③ 7.C8.D 9.略 10.①鹤立鸡群②颔首低眉③神秘莫测④麻木不仁 11.略12.略13.略 二、(一)甲、 第1题，这是描写托尔斯泰犀利的目光。作者运用比喻写出托尔斯泰眼睛深刻、准确的洞察力。 第2题，高尔基运用夸张的手法，干脆有力，含蓄隽永，耐人寻味，表现托尔斯泰的眼睛蕴藏着丰富的感情。
第3题，“闪光的珠宝”是指托尔斯泰那双珍贵、敏锐的眼睛;“甲壳”原指虾蟹等动物的外壳，质地坚硬，有保护身体的作用;现指胡子、眉毛、头发保护眼睛。这是用粗鄙的外表来保护精美的珠宝——眼睛，这也是欲扬先抑手法的艺术效果。 第4题，托尔斯泰晚年吃素，从事体力劳动，并希望放弃私有财产和贵族特权，因而和他的夫人意见冲突，家庭关系变得紧张起来。后来他离家出走，途中感冒，于1910年病逝于火车站。 第5题，描写托尔斯泰那非同寻常的眼睛 (二)乙、 6.大雁归来与大雁觅食 7.C 8.所种的松树和停留的大雁。 9.①拟人②比喻③拟人 10.作者对大雁充满了喜爱之情。他认为大雁是人类的伙伴、朋友。 11.①大②借③等待 12.B13.B 14.①因此人家多愿意把书借给我。②我恭敬地站在他旁边，提出疑难，询问道理。 15.刻苦勤奋谦恭诚恳。 【篇二】 P18： 赏花归去马如飞，去马如飞酒力微。酒力微醒时已暮，醒时已暮赏花归。 P20：略
2020八年级语文乐园暑假作业答案 语文乐园(一) 一、1、(1)①化用诗句，提醒读者保持安静。或：运用反复，强调保持安静的重要。 ②巧用比喻，告诉人们在帮助别人的同时，自己也得到快乐(帮 助别人，快乐自己)。或：巧用比喻，倡导关爱别人。 (2)国内：和(和谐)――创建和谐社会是2006年的主旋律。 医疗――药价高，看病难，引起政府和百姓的共同关注。 (其它如"教育”“收费”“博客”“农民工”等均可) 国际：核――朝鲜、伊朗等国家的核问题受到国际社会广泛关注。 石油――因能源紧张，导致石油价格不断上涨。2、(1)如：①组织全组同学上街收集各种招牌上的错别字; ②让同学们分头到街上的广告张贴处去查找广告中的错别字。(2)同音错、形近错、简化字(3)例：①加大宣传力度，普及常用汉字。 ②利用报纸、电视等媒体，开设专题讲座。 ③让有文化的人来教，没文化的人来学，提高全民整体文化素质。 ④加强社区文化建设，大家一起“自查互纠” 二、(一)3、写了母亲辛苦持家，热情待客，应对变乱，助儿升学，宽仁离别的事情。(答出其中任何4点、意思符合即可) 4、(1)母亲和儿子分别的不舍;母亲艰难筹款的辛酸(“对儿子选择的支持”也可) (2)母亲对儿子学业有成、能帮衬家庭的欣慰。
5、(1)运用了动作、神态描写，生动形突地写出了母亲对儿子回家过年的喜悦，得知儿子即刻就要返校的惊讶及无奈。(意思符合即可) (2)运用反复(或反问)的修辞手法，强调了对母亲去世的痛惜和不能奉养的遗憾之情，总结全文。 6、理解：母亲不仅养育了我，同时影响到我的习惯、个性、精神，影响了我一生。 感悟：【示例】父母是我们生活中的第一任老师，当我们遇到困难、意志消沉的时候，总是教导我们鼓起勇气，战胜困难，走向未来。(只要言之成理即可)。 写了母亲辛苦持家，热情待客，应对变乱，助儿升学，宽仁离别的事情。(答出其中任何4点、意思符合即可) 2.(1)母亲和儿子分别的不舍;母亲艰难筹款的辛酸(“对儿子选择的支持”也可) (2)母亲对儿子学业有成、能帮衬家庭的欣慰。 3. (1)运用了动作、神态描写，生动形突地写出了母亲对儿子回家过年的喜悦，得知儿子即刻就要返校的惊讶及无奈。(意思符合即可) (2)运用反复(或反问)的修辞手法，强调了对母写了母亲辛苦持家，热情待客，应对变乱，助儿升学，宽仁离别的事情。。 (答出其中任何4点、意思符合即可) 2. (1)母亲和儿子分别的不舍;母亲艰难筹款的辛酸(“对儿子选择的支持”也可) (2)母亲对儿子学业有成、能帮衬家庭的欣慰。 3.
人教版八年级下学期数学试题 姓名:________ 班级:________ 成绩:________ 一、单选题 1 . 如图，等边与正方形重叠，其中，两点分别在，上，且，若， ，则的面积为（） A．1B． C．2D． 2 . 若函数y＝3x﹣1与函数y＝x﹣k的图象交点在第四象限，则k的取值范围为（） A．B．C．k＜1 D．或 3 . 二次根式中，最简二次根式有（）个A．B．C．D． 4 . 在平面直角坐标系中，直线y＝kx+b的位置如图所示，则不等式kx+b＜0的解集为（） A．x＞﹣2B．x＜﹣2C．x＞1D．x＜1
5 . 2022年将在北京﹣张家口举办冬季奥运会，很多学校开设了相关的课程．某校8名同学参加了冰壶选修课，他们被分成甲、乙两组进行训练，身高（单位：cm）如下表所示： 队员1队员2队员3队员4 甲组176177175176 乙组178175177174 设两队队员身高的平均数依次为，，方差依次为S甲2，S乙2，下列关系中完全正确的是（） A．＝，S甲2＜S乙2B．＝，S甲2＞S乙2 C．＜，S甲2＜S乙2D．＞，S甲2＞S乙2 6 . 如图，在中，对角线与相交于点，且.若，，则的长为（） A．3B．2C．4D．5 7 . 下列计算正确的是（） D． A．B． C． 8 . 下列四组数据中，“不能”作为直角三角形的三边长的是（） A．3，4，6B．5，12，13C．6，8，10D．，，2 9 . 张老师家1月至12月的用电量统计如图所示，这组数据的众数和中位数分别是（）
A．25和17.5B．30和20C．30和22.5D．30和25 10 . 如图，平行四边形ABCD的对角线交于点O，且AB=6，△OCD的周长为16，则AC与BD的和是（） A．22B．20C．16D．10 11 . 若代数式有意义，则实数x的取值范围是（） A．x≠2B．x≥0C．x＞0D．x≥0且x≠2 12 . 如图，正方形ABCD的边长为6，点E、F分别在AB，AD上，若CE=3，且∠ECF=45°，则CF长为（） A．2B．3 C．D． 二、填空题 13 . 化简：=________. 14 . 某学校举行理科（含数学、物理、化学、生物四科）综合能力比赛，四科的满分都为100分．甲、乙、丙三人四科的测试成绩如下表： 学科数学物理化学生物
第十七章 勾股定理 17.2勾股定理的逆定理（2） 1.如果△ABC 的三边a,b,c 满足关系式182-+b a +（b-18）2+30-c =0则△ABC 是 _______三角形。 2.若△ABC 的三边a 、b 、c ，满足（a －b ）（a 2＋b 2－c 2）=0，则△ABC 是（ ） A ．等腰三角形； B ．直角三角形； C ．等腰三角形或直角三角形； D ．等腰直角三角形。 3．如果三角形的三边长为1.5，2，2.5，那么这个三角形最短边上的高为______． 4．写出下列命题的逆命题，并判断真假． （1）如果a=0，那么ab=0； （2）如果x=4，那么x 2=16； （3）面积相等的三角形是全等三角形； （4）如果三角形有一个内角是钝角，则其余两个角是锐角； （5）在一个三角形中，等角对等边． 5．A ，B ，C 三地的位置及两两之间的距离如图所示，则点C ?在点B ?的方位是_____． 6．如图所示，四边形ABCD 中，BA ⊥DA ，AB=2，CD=3，BC=5，求∠ADC 的度数．
7.已知：如图，四边形ABCD ，AB=1，BC= 43，CD=4 13，AD=3，且AB ⊥BC 。 求：四边形ABCD 的面积。 8.若△ABC 的三边a ，b ，c 满足条件a 2+b 2+c 2+338=10a+24b+26c ，试判定△ABC 的形状． 9.一根24米绳子，折成三边为三个连续偶数的三角形，则三边长分别为多少米？此三角形的形状为？ 10.已知△ABC 的三边为a 、b 、c ，且a+b=4，ab=1，c=14，试 判定△ABC 的形状。 C D