1复习
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翻译练习1:1:Eager to trust but determined to verify, many single women in an age of risky romance are hiring private detectives to check the background of their suitors. 【译文】在这个爱情不太可靠(爱情保险系数并非很高)的年代,许多单身女子想要相信她们的求婚者,但又想看看对方是否靠得住,于是就雇用私人侦探去查清对方的身世背景.2:China has roughly 380 million women between the ages of 15 and 55, and few of them---particularly in the big cities---want to look any less than the best their budgets allow.2【译文】中国15至55岁的女性大约有3.8亿。
只要经济条件允许,几乎人人都想尽可能地把自己打扮得光鲜靓丽,在大城市更是如此。
3.And I take heart from the fact that the enemy, which boasts that it can occupy the strategic point in a couple of hours, has not yet been able to take even the outlying regions, because of the stiff resistance that gets in the way.3. 【译文】敌人吹嘘能在几小时内就占领战略要地,但由于遭到顽强抵抗,他们甚至还没能占领外围地带。
这一事实让我有了信心。
4. Since natural water contains dissolved oxygen, fishes, which also need oxygen though they live in water, will die if hot days persist so long that the dissolved oxygen is evaporated.4. 【译文】鱼类虽然水栖,但也需要氧气,而天然水是含有溶解氧的,因此如果天热得过久使水中的溶解氧蒸发掉了,鱼就要死亡。
大学英语(1)复习资料I. V ocabulary (词汇:选择一个合适的词语并以适当形式填入相应的句子中,每个词只能使用一次)1. Many educators are giving up traditional methods of teaching in favor of more modern ________ .2. Both of Mr. Black‟s sons ________ their studies abroad now, once in France and the other in China.3. The people of Africa have successfully fought against _________ rule.4. Shall I just order beer, or is there some ________ drink you prefer?5. Our company _______ a close working relationship with a similar firm in France.6. A man of humble _______ , Lincoln eventually became President of the United States through his own efforts.7. He was burning with ________ to know what was happening.8. If you‟re looking for somewhere to rent, I think there is a _______ apartment in my buil ding.9. I could not tell whether he ________ from heat or from fear.10. The boy‟s teachers looked upon his worsening performance with _________ .1-5 approaches, pursue, colonial, sole, established6-10 origin, curiosity, vacant, was sweating, disapprovalII. Explanation (词组解释:用英语解释划线的词组)1 Ethal liked the gray row house right off and moved in a month later. She found a bunch of tough-looking young men hanging out on her stoop before long.2. I suggested that he could take the toy apart to see how it did work, but he refused it, and he never did work out the solution eventually.3 There were no more butterflies in my stomach after five years. I could handle whatever I found even if the case was one in which it was impossible to anticipate the problem in advance.4. Judging by the expression of the headmaster on his face, my answer not attaching much importance to his question made him unsatisfactory.5 I have never been able to track down the story that the American naturalist commands all the guests to join the game while the cobra made for the bowl of milk.1. immediately, wandering aimlessly or killing time2. separate the toy into pieces, find the answer to3. feeling of nervousness, ahead of time4. Forming an opinion based on, paying emphasis upon5. discover or search for, head/crawl forⅢ.Reading Comprehension(阅读理解:每题选择一个最佳选项)Passage AThis is what the police say happened beginning at 3:20 AM in the proper, tree-lined neighborhood. Twenty-eight-year-old Marissa Parry was returning home from her job as manager of a bar. She parked her car in a lot next to the local railroad station, locked the door, and started to walk the 100 feet to the entrance of her apartment. The entrance to the apartment is at the rear of the building as the front of the building contains small stores. The neighborhood was covered in a sleeping darkness.Miss Parry noticed a man at the far end of the lot, near a seven-storey apartment house. She halted, then, nervously, she headed up the street, where there is a police call box. She got as far as a street l ight in front of a bookshop, before the man grabbed her. She screamed, “Oh, my God, he stabbed me! Please help me!”. Lights went on in the ten-storey apartment house across the street. Windows were opened and voices spoke in the early-morning stillness. From one the upper windows in the apartment house, a man called down: “Let the girl alone!” The man looked up at him, shrugged(耸肩), and walked down the street toward a white car. Miss Parry struggled to her feet.Lights went on. The man returned to Miss Parry, stabbed her again. Miss Parry called out, “I‟m dying! I‟m dying!” windows were open again and lights went on in many ap artments. The man got into the car and drove away. Miss Parry staggered to her feet, and at the time a city bus passed. The man returned. By then, Miss Parry had crawled(爬行) to the back of the building where doors to the apartment house held out hope for afety. The killer found her at the second door, lying on the floor at the foot of the stairs. He stabbed her again—killing her.Fifteen minutes later, the police received their first call, from a man who was a neighbor of Miss Parry. In two minutes they were at the scene. The neighbor, a 70-year-old woman, and another woman were the only persons on the street. Nobody else came forward. The man explained that he had called the police after much thought. He had phoned a friend for advice and then he had gon e to the apartment of the elderly woman to get her to make the call. “I didn‟t want to get involved,” he told the police.1. When happen the murdering in proper neighborhood? ________A. at duskB. at noonC. at nightD. at dawn2. Why did Miss Parry head up the street when she found a man at the far end of the lot? ________A. calling the policeB. asking the help from the familyC. asking the help from the neighborsD. running away the scene3. Does the man calling the police immediately the killing took place? ________A. YesB. NoC. The passage doesn‟t mention it4. How many times did the man stab Miss Parry throughout the accident? ________A. twoB. threeC. fourD. five5. The author expresses the emotion of ________ to the killing case.A. sympathyB. indignationC. curiosityD. indifferencePassage BI‟m usually fairly skeptical about any research that concludes that people are either happier or unhappier or more or less certain of themselves than they were 50 years ago. While any of these statements might be true, they are practically impossible to prove scientifically. Still, I was struck by a report which concluded that today‟s children are significantly mor e anxious than children in the 1950s. In fact, the analysis showed, normal children ages 9 to 17 exhibit a higher level of anxiety today than children who were treated for mental illness 50 years ago.Why are America‟s kids so stressed? The report cites two main causes: increasing physical isolation—brought on by high divorce rates and less involvement in community, among other things—and a growing perception that the world is a more dangerous place.Given that we can‟t turn the clock back, adults can still do plenty to help the next generation cope. At the top of the list is nurturing (培育) a better appreciation of the limits of individualism. No child is an island. Strengthening social ties helps build communities and protect individuals against stress.To help kids build stronger connections with others, you can pull the plug on TVs and computers. Your family will thank you later. They will have more time for face-to-face relationships, and they will get more sleep.Limit the amount of virtual (虚拟的) violence your children are exposed to. It‟s not just video games and movies; children see a lot of murder and crime on the local news.Keep your expectations for your children reasonable. Many highly successful people never attended Harvard or Yale.Make exercise part of your daily routine. It will help you cope with your own anxieties and provide a good model for your kids. Sometimes anxiety is unavoidable. But it doesn‟t have to ruin your life.6. The author thinks that the conclusions of any research about people‟s state of mind are ________.A. surprisingB. confusionC. illogicalD. questionable7. What does the author mean when he says, “we can‟t turn the clock back” (Line 1, Para. 3)?A. It‟s impossible to slow down the pace of change.B. The social reality children are facing cannot be changed.C. Lessons learned from the past should not be forgotten.D. It‟s impossible to forget the past.8. According to an analysis, compared with normal children today, children treated as mentally ill50 years ago ________.A. were less isolated physicallyB. were probably less self-centeredC. probably suffered less from anxietyD. were considered less individualistic9. The first and most important thing parents should do to help their children is ________.A. to provide them with a safer environmentB. to lower their expectations for themC. to get them more involved sociallyD. to set a good model for them to follow10. What conclusion can be drawn from the passage?A. Anxiety, though unavoidable, can be coped with.B. Children‟s anxiety has been enormously exaggerated.C. Children‟s anxiety can be eliminated with more parental care.D. Anxiety, if properly controlled, may help children become mature.Passage CIt was clearly the headmaster himself that opened the door. He was short and fat, with a sandy-colored moustache, a wrinkled forehead and hardly any hair. He looked at me with an air of surpris ed disapproval, as a colonel might look at a private whose bootlaces were undone. …Ah, yes. You‟d better come inside,‟ he grunted. The narrow, sunless hall smelled unpleasantly of stale cabbage; the walls were dirty with ink marks; it was all silent. …You‟d better sit down,‟ he said, and proceeded to ask me a number of questions: what subjects I had taken in my General School Certificate; how old I was; what games I played; then fixing me suddenly with his bloodshot eyes, he asked me whether I thought games were a vital part of a boy‟s education. I mumble something about not attaching too much importance to them. He grunted. I had said the wrong thing. The headmaster and I obviously had very little in common.The school was made up of one class of twenty-four boys, ranging in age from seven to thirteen. I should have to teach all subjects except art, which he taught himself. Football and cricket were played in the Park, a mile away on Wednesday and Saturday afternoons. The teaching set up filled me with fear. I should have to divide the class into three groups and teach them in turn at three different levels; and I was dismayed at the thought of teaching algebra and geometry — two subjects at which I had been completely incompetent at school. Worse perhaps was the idea of Saturday afternoon cricket; most of my friends would be enjoying leisure at that time.I said shyly, …What would my salary be?‟ …Twelve pounds a week plus lunch.‟ Before I could protest, he got to his feet. He said, …Now, you‟d better meet my wife. She is the one who really runs the school.‟ This was the last straw. I was very young: the prospect of working under a woman constituted the ultimate indignity.11. The headmaster looked at the author disapprovingly ________ .A. because the latter had left his bootlaces undoneB. because the latter looked too nervousC. because the latter didn‟t show due respectD. as an officer look at a carelessly dressed soldier12. After the author was asked a number of questions, he concluded that the headmaster _______ .A. didn‟t like to play the same gamesB. believed the games was very key to a boy‟s educationC. attached great importance to artD. was a game fan13. The idea of Saturday afternoon cricket was even more discouraging because ________ .A. he had to walk a mile to get to the cricket fieldB. he wasn‟t good at playing cricketC. most of his friends would be free at that timeD. he didn‟t like to play little boys in public14. If the author had had a chance, he would have protested _________ .A. at the term offered by the headmasterB. about meeting the headmaster‟s wifeC. against having lunch at schoolD. about playing cricket on weekends15. We can infer that the author ________ at the end of the story.A. coul dn‟t decide whether he should accept the job or notB. had no choice but to accept itC. refused the job though he needed itD. accepted the job though he didn‟t like it 1-5 D C BBB 6-10 D B C C A 11-15 D B C A CⅣ. Translation (翻译)1. 妈妈上楼来查看我们这些孩子时,我转过身假装睡着了。
人教版二年级数学期末复习1数与代数复习[解析版]知识图谱100以内的不进位加法竖式知识精讲一.笔算加法时,个位和个位上的数对齐,十位和十位上的数对齐,从个位算起.二.两位数加两位数:不进位和进位。
重点是进位,个位加个位,满十向前一位进一,十位加十位,记得加小1 三.两位数减两位数:不退位减和退位减。
重点是退位减,个位不够,从十位退一,十位减的时候不要忘记退掉1 四.100以内的加减混合运算:不带括号的混合运算,按照从左到右的顺序列竖式计算;带括号的混合运算:(1)小括号起到改变运算顺序的作用;(2)运算中有小括号,改变了原有的运算顺序,则不能把两个竖式简写成一个竖式的形式;(3)在带小括号的运算中,一般先算小括号里面的五.乘法是求几个相同加数的和的简便运算,在乘法算式中,乘号前面和后面的数叫乘数,乘得的结果叫积. 六.1~9的乘法口诀七.乘加乘减:先算乘法再算加减法100以内的加减法例题1、 用竖式计算. 35+27= 18+43= 65+15= 46+26=例题2、 列竖式计算:(1)259-=______;(2)878-=______.例题3、 小白兔拔了18个萝卜,比小灰兔少拔6个。
小灰兔拔了多少个萝卜?两只小兔一共拔了多少个萝卜?随练1、 用竖式计算.28+47= 60—34= 93—28= 9+56= 100—78= 17+83=随练2、 的下面藏着几?随练3、 王林买了两件不同的物品,最多会用多少钱?最少会用多少钱?表内乘法一例题1、 3+3+3+3+3+3=3×( ) 5+5=( )×2例题2、(1)买3个水杯和1个笔筒需要多少元? (2)买4个笔筒和1个水杯需要多少元? (3)买3个笔筒比买1个水杯多花多少元?例题3、 (1)这些小狗一共有多少只耳朵?(2)这些小狗一共有多少条腿?随练1、 王老师去体育商店买羽毛球拍,商店里正在进行活动,买1副球拍送1个羽毛球,王老师买了3副球拍.那么,(1)一共买了几个羽毛球拍?(2)商店应该送王老师几个羽毛球?8 2 - 3 746 3 - 2 675 0 - 827 4 - 86( )( )( )( )随练2、(1)买5张成人票多少钱?(2)上二年级的小刚和他的3个同学到公园玩,他们买门票要用多少元?(3)李老师带5个二年级的学生到公园玩,20元钱买门票够吗?随练3、列式计算。
复习自测题(1)——交际用语阅读下面的小对话,从A、B、C三个选项中选出一个能填入空白处的最佳选项,并在答题纸上写出所选的字母符号。
表达问候1.—Hello, r m Xiaoyan. Nice to meet you.A.r m nice, tooB.Fine, thank youC.Nice to meet you, too. I' m David Manning2.—Hello, Linda, how are you?A.Very good. Are you good?B.Very well, thank you. And you?C.Hello, Rose, how do you do?谈论工作3.—What do you do?A.I am a policemanB.I am washing the dishes nowC.I do my homework4.?一My father is a manager. My mother is a nurse.A.Where are your parentsB.What do your parents doC.What are your parents doing right now谈论时间5.一How long does it take from Beijng to London by plane?A.It costs 1,200 dollarsB.It takes about 7 hoursC.It' s not near enough6.一How long does it take to go there by train?A.It is 20 poundsB.It takes 20 hoursC.The training is very fast7.—— What time does the train leave?A.On Tuesday Bin the morning C.At half past five表达提议8.—The shower isn' t working.A.I come to call the plumberB.r 11 call the plumberC.I like calling the plumber9.—Would you like to go with us?A.Ok, r d loveB.I would likeC.r d love to10—?一An orange juice, please.A.What do you likeB.What would you likeC.Would you like an orange juice11.—.一That' s a good idea.A.When can you write the invitationsB.What do you think of the invitationsC.Why don' t we write the invitations now12.一Could you ring them up please? I' m sometimes quite nervous on the phone.A.Are you? I am fine.B.Yes, why don' t you call them?C.Yes, of course. I will phone them for you.13.一How about seeing a film this evening?—Yes,.A.that' s a good ideaB.pleaseC.that' s right问路与指路14.一Excuse me, where is the nearest bank, please?A.It' s not sureB.That,s all rightC.It' s next to the newsagent15.—Excuse me, how do I get to the gym, please?A.You take the number 866 bus from the supermarketB.It takes about an hour to get thereC.r d like to see them描述人的外貌16.— What does your English teacher look like?A.She likes singingB.She' s tall and has long, wavy hairC.She looks sad17.—What does her boyfriend look like?A.He is intelligent and confidentB.He likes playing footballC.He is quite tall with fair curly hair描述天气18.— What' s the weather like in this area?A.That' s all rightB.It' s rainyC.Yes, it' s fine询问价格(Unit 5 )19.—How much is the rent of the flat?A.The hotel room is expensiveB.It is 450 pounds a monthC.It is near the center of the city询问病情20—?一ve got a bad cough.A.What' s the matter with youB.What is it likeC.How was your day yesterday 参考答案:■ 一l.C 2.B 3.A 4.B 5.B6.B7.C8.B9.C 10. Bll.C 12.C13.A14.C15.A16. B17.C18.B19.B20.A复习自测题(2)——词汇与结构阅读下面的句子和对话,从A、B、C三个选项中选出一个能填入空白处的最佳选项。
一、整除理论 1.证明:任意给定的连续39个自然数,其中至少存在一个自然数,使得这个自然数的数字和能被11整除。
2.设p 是n 的最小素约数,n = pn 1,n 1 > 1,证明:若p >3n ,则n 1是素数。
证明:设不然,n 1 = n 2n 3,n 2 ³ p ,n 3 ³ p ,于是n = pn 2n 3 ³ p 3, 即p £3n ,矛盾。
3.设3a 2b 2,证明:3a 且3b 。
写a = 3q 1 + r 1,b = 3q 2 + r 2,r 1, r 2 = 0, 1或2,由3½a 2+ b 2= 3Q + r 12+ r 22知r 1 = r 2 = 0,即 3½a 且3½b 4.证明:对于任意给定的n 个整数,必可以从中找出若干个作和,使得这个和能被n 整除。
设给定的n 个整数为a 1, a 2, L, a n ,作 s 1 = a 1,s 2 = a 1 + a 2,L ,s n = a 1 + a 2 + L + a n ,如果s i 中有一个被n 整除,则结论已真,否则存在s i ,s j ,i < j , 使得s i 与s j 被n 除的余数相等,于是n ½s j - s i = a i + 1 + L + a j5.设a ,b ,c 是正整数,证明:),)(,)(,(),,(],][,][,[],,[22a c c b b a c b a a c c b b a c b a因为,故只须证明(a , b , c )(ab , bc , ca ) = (a , b )(b , c ) (c , a ),此式用类似于例3的方法即可得证。
6.设k 是正奇数,证明:1 2 …… 91k 2k …… 9k。
设s = 1k+ 2k+ L + 9k,则由2s = (1k+ 9k) + (2k+ 8k) + L + (9k+ 1k) = 10q 1及2s = (0k+ 9k) + (1k+ 8k) + L + (9k+ 0k) = 9q 2得10½2s 和9½2s ,于是有90½2s ,从而1 + 2 + L + 9 = 45½s 7.设a ,b 是正整数,证明:(ab )[a , b ] = a [b , ab ]。
英语1复习资料复习一1—e 2-—-d 3—-—c 4—-—b 5-—-a一.Match the phrases with Chinese translation.1. be filled with a。
和…分享2。
get involved in b。
结果却…3. in terms of c. 在…方面4. only to do d. 参与某些活动5。
share .。
with e. 充满二.Fill the blanks with the words given below. Change the form where necessary。
1. They should be ________for planning and carrying out the financial policies of the company。
2.No final decision has been _________taken, but it seems likely that the two companies couldmerge in the near future。
3.The girl was very upset because she could not get these coffee _________out of the newcarpet。
4.They said that they would innovate with persistence to________ the product in the comingyear.5.April sunlight_________ over the water, dancing across snow-covered fields.6.I got a free_________ of eye shadow。
Could you show me how to use it?7.It is generally accepted that giving advice at the right time has to________ a great deal ofintelligence.8.Have you found the small symbols on this map which denote________places and museums?9.The freshmen were recommended to read the book which was filled with _________insights。
期末复习资料之一 必修1 复习题一、选择题1、 下列函数中,在区间()0,+∞不是增函数的是( ) A.xy 2= B. x y lg = C. 3x y = D. 1y x=2、函数y =log 2x +3(x≥1)的值域是( )A.[)+∞,2B.(3,+∞)C.[)+∞,3D.(-∞,+∞)3、若{|2},{|xM y y P y y ====,则M∩P ( )A.{|1}y y >B. {|1}y y ≥C. {|0}y y >D. {|0}y y ≥ 4、对数式2log (5)a b a -=-中,实数a 的取值范围是( )A.a>5,或a<2B.2<a<5C.2<a<3,或3<a<5D.3<a<45、 已知xax f -=)( )10(≠>a a 且,且)3()2(->-f f ,则a 的取值范围是( )A. 0>aB. 1>aC. 1<aD. 10<<a6、函数y =(a 2-1)x在(-∞,+∞)上是减函数,则a 的取值范围是( ) A.|a |>1 B.|a |>2C.a>2D.1<|a |<26、函数)1(log 221-=x y 的定义域为( )A 、[)(]2,11,2 -- B 、)2,1()1,2( -- C 、[)(]2,11,2 -- D 、)2,1()1,2( --8、值域是(0,+∞)的函数是( )A 、125xy -=B 、113xy -⎛⎫= ⎪⎝⎭C、yD9、函数|log |)(21x x f =的单调递增区间是A 、]21,0( B 、]1,0( C 、(0,+∞) D 、),1[+∞10、图中曲线分别表示l g a y o x =,l g b y o x =,l g c y o x =,l g d y o x =的图象,,,,a b c d 的关系是( )A 、0<a<b<1<d<cB 、0<b<a<1<c<dC 、0<d<c<1<a<bD 、0<c<d<1<a<b11、函数f(x)=log 31(5-4x-x 2)的单调减区间为( )A.(-∞,-2)B.[-2,+∞]C.(-5,-2)D.[-2,1]12、a=log 0.50.6,b=log 20.5,c=log 35,则( )A.a <b <cB.b <a <cC.a <c <bD.c <a <b13、已知)2(log ax y a -=在[0,1]上是x 的减函数,则a 的取值范围是( )A.(0,1)B.(1,2)C.(0,2)D.[2,+∞]14、设函数1lg )1()(+=x x f x f ,则f(10)值为( )A .1 B.-1 C.10 D.101 二、填空题 15、函数)1(log 21-=x y 的定义域为 16、.函数y =2||1x -的值域为________ 17、将(61)0,2,log 221,log 0.523由小到大排顺序:x18. 设函数()()()()4242xx f x x f x ⎧≥⎪=⎨<+⎪⎩,则()2log 3f =19、计算机的成本不断降低,如果每隔5年计算机的价格降低31,现在价格为8100元的计算机,15年后的价格可降为20、函数),2[log +∞=在x y a 上恒有|y|>1,则a 的取值范围是 。
二、表内除法1、平均分的含义:把一些物品分成几份,每份分得同样多,叫平均分。
2、除法的2种含义:把一些东西平均分成几份,求每份是多少;用除法计算,总数÷份数=每份数。
把一个数量按每份是多少分成一份,求能平均分成几份;用除法计算,总数÷每份数=份数。
3、除法算式的读法:从左到右的顺序读,“÷”读作除以,“=”读作等于,其他数字不变。
24÷4=6读作:24除以4等于64、除法算式各部分名称:被除数÷除数=商。
5、用乘法口诀求商,想:除数×商=被除数。
6、“求一个数是另一个数的几倍”也就是求“一个数里面有几个另一个数”,都用除法计算,用“一个数÷另一个数=倍数”。
7、用乘法和除法两步计算解决问题时,所求问题是总数,用乘法计算;所求问题是份数或每份数,用除法计算。
8、在需要提出问题并解决时,可以提:①加法的问题:求总数,“谁和谁一共是多少?”。
②减法的问题:进行比较。
“谁比谁多多少?;“谁比谁少多少?”。
③除法的问题:有倍数关系的可以提出用除法计算的问题,“谁是谁的几倍?”,“是”字前写较大数,“是”字后写较小数。
9、一件物品的价格叫单价,买几件叫数量,买几件共需要的钱叫总价。
单价×数量=总价。
总价÷单价=数量。
总价÷数量=单价。
【复习要求】1.理解平均分和除法算式的含义;能用除法算式表示平均分。
2.能熟练用2~9的乘法口诀求商;3.能够解决有关平均分和乘法、除法两步计算实际问题;4.能够解决“一个数是另一个数的几倍”的实际问题;能够掌握乘除混合运算顺序和表内乘除知识解决两步计算实际问题。
【典型题】一、填空。
1.在12÷6=2中,被除数是(),除数是(),商是()。
2.有12个△,每3个一份,可以分成()份,算式()。
3.20÷5=4表示把()平均分成()份,每份是()。
4.20÷4=(),用的乘法口诀是()。
5.用18个○摆一摆,每堆3个,可以分成()堆;每堆9个,可以分成()堆。
6.56是7的()倍;6的()倍是48 。
7.被除数是12,除数是6,商是()。
8. 在()里填上适当的数。
3×()=15()×4 =165×()=25()÷2 = 520÷()=4()÷()=4四、写算式。
用一句口诀写出两个乘法算式和两个除法算式四九三十六二七十四三八二十四五、写算式。
写出除法算式并计算。
1.63除以9,商是多少?2.被除数是27,除数是3,商是多少?3.把32平均分成4份,每份是多少?4.把24个苹果,每8个放一份,可以分多少份?5.12里面有几个4?6.从12里面连续减去几个2得0?7.32是8的几倍?六、解决问题。
1.学校买来4包故事书,每包9本,要把这些故事书平均分给6个班,每班可以分多少本?答:每班可以分()本。
2.动物园有48只牛有8只,猴子的只数是牛的几倍?答:猴子的只数是牛的()倍。
3. 一瓶钙片,我每天吃3次,每次吃3片,6填吃完这瓶钙片。
这瓶钙片有多少片?答:这瓶钙片有()片。
三、图形与变换1、角:锐角、直角、钝角。
锐角比直角小,钝角比直角大。
2、平移:当物体沿水平方向或竖直方向运动时,是直线运动。
自身方向不发生改变。
如:推拉窗。
3、旋转:当物体围绕着一个点或一个轴做圆周运动时,自身方向会发生改变。
如:方向盘。
4、平移的方法:①先确定平移方向和格子数(也就是距离)。
②找到原图形的各个顶点。
③把各个按相同方向平移相同的格子数。
④把新顶点按原图形的顺序连接。
【考点】锐角、钝角;平移和旋转;复式统计表;【复习要求】1.会辨和画锐角、直角、钝角;2.能够辨别一些生活重现象是否是平移和旋转;3.会在方格纸中画一个图形平移后的图形;【典型题】一、填空。
1.锐角、钝角、直角按从大到小的顺序是()>()>().2.钟表的指针运动是()现象,滑滑梯是)现象。
3.10时整,分针和时针形成的角是()。
四、万以内数的认识1、“个、十、百、千、万”是我们学过的五个计数单位,分别在个位、十位、百位、千位、万位上表示。
相邻两个计数单位之间的进率是10。
10个一是十,10个十是一百,10个一百是一千,10个一千是一万。
2、数位顺序表里:从右边起,第一位是个位,第二位是十位,第三位是百位,第四位是千位,第五位是万位。
数数:能够一个一个地数,十个十个地数,一百一百地数,一千一千地数。
10个一千是();1500由()个百组成;2340由()十组成。
和2898相邻的数是()和()一百一百地数,写出2880后面的五个数数位顺序表中,从右起,第三位是()位、万位是第()位;百位右边是()位。
3、读数和写数都从高位起。
万以内数的读法:读数时,要从高位读起,万位上是几就读几万,千位上是几就读几千,百位上是几就读几百,十位上是几就读几十,个位上是几就读几,中间有一个“0”或者连续两个“0”就只读一个“零”,末尾不管有几个0都不读。
2019读作();7008读作()4、万以内数的写法:写数时,也要从高位写起,几个千就在千位上写几,几个百就在百位上写几,几个十就在十位上写几,几个一就在个位上写几,哪一位上一个数字也没有就写“0”占位。
5、数的组成:就是看每个数位上是几,就有几个这样的计数单位组成。
3个一、七个百,五个千,这个数写作(),读作()表示一个数5003的方法主要有:五千零三、五个千和三个一、计数器上画珠子或同学自己写的5000+3等6、数的大小比较的方法:①位数多的大于位数少的数;②位数相同时,就比较最高位上的数字,数字大的这个数就大,反之就小;③如果最高位上的数字相同,就比较下一位上的数,依次类推。
注意题目要求是从大到小排还是从小到大排列;7、最大的一位数:9,最小的一位数:1最大的两位数:99,最小的两位数:10两位数最高位是十位。
最大的三位数:999,最小的三位数:100三位数最高位是百位。
最大的四位数:9999,最小的四位数:1000四位数最高位是千位。
最大的五位数:99999,最小的五位数:10000. 五位数最高位是万位。
最低位都是个位。
【考点】万以内数的读写、组成;万以内数的数位顺序和计数单位;万以内数的大小比较;认识近似数。
【典型例题】一、填空。
1.46个十是(),3200里面有()个100.2.1000里有()个百,500里有()个百。
3. 4506是由4个(),5个()和6个()组成的。
4.8716=( 8000)+ ()+()+().5.一个四位数千位和百位上的数都是7,其余数位上都是零,这个数是()。
6.和9999最相邻的两个数是()和().【复习建议】1、抓住基本知识点进行练习:例如:(1)计数单位、数位的概念:重点熟练掌握10个一百是一千、10个一千是一万。
一千里面有10个一百、一万里面有10个一千。
(2)明确计数单位“个、十、百、千、万”所占的位置叫数位,数位是按照一定的顺序排列的,要熟记:从右边起第一位是个位,第二位是十位,第三位是百位,第四位是千位,第五位是万位。
(3)掌握万以内数读法、写法、组成,明确各个数位上的数字所表示的意义。
2、抓住学生的易错点重点练习。
例如:(1)按规律数数8870、8880、8890、()、()、()(2)与900相邻的两个数是()和()以上两种题易混淆。
要让学生明确“相邻数”的概念。
(3)190里面有()个十,3400里面有()个百。
3、注意练习形式的多样化。
例如“写数”可以包括:(1)看图写数例如:74页例5和75页做一做第1题(2)根据组成写数。
写出由2个百、5个十和6个一组成的数。
()(3)根据数位写数。
有一个四位数,千位上的数字是6,个位上的数字是3,其余数位上的数字是0,这个数是()。
(4)按要求写数。
①最大的两位数是(),比它多1的数是()。
②比最小的四位数少1的数是()。
③用5、7、0、0组成的四位数中,一个零都不读出来的数有______________________,只读一个零的数有:____________________;组成最大的四位数是(),组成最小的四位数是()。
【典型举例】2.按要求写数。
(1)七百五十六:(2)5个千、8个百、4个十、3个一(3)三位数中的最大数、最小数:(4)四位数中的最大数、最小数:3.写近似数。
(1)育华小学有1302人,约是()人。
(2)一台电视机的售价是998元,约是()元。
(3)小红从家到学校有799米,约是()米。
(4)一头牛重302千克,约是()千克。
4. 填上合适计数单位。
(十、百、千)(1)育华小学大约有八()人。
(2)某小学一个班大约有四()人。
(3)红棉小区约有九()人。
4、设计一些综合性的练习(1)3个千、7个十和5个一组成的数是(),它是()位数。
(2)比最大的两位数多1的数是(),这个数的最高位是()位。
五、万以内的加法和减法(一)1、可以口算也可以笔算。
注意在笔算加法是:相同数位对齐,从个位加、减起,如果哪一位相加满十,要向前一位进1,如果哪一位不够减,就从前一位退1作10再减.2、估算方法:估算成整百数:看十位,①十位小于五的(4、3、2、1、0)就少看,直接把个位、十位舍去写作“0”。
(四舍)如:532≈500②十位大于五或者等于五的(5、6、7、8、9)就多看,把个位、十位写作“0”的的同时还要在百位上加上1.(五入)如:567≈600估算成几百几十数(整十数):看个位,①个位小于五的(4、3、2、1、0)就少看,直接把个位舍去写作“0”。
(四舍)如:532≈530②个位大于五或者等于五的(5、6、7、8、9)就多看,把个位写作“0”的的同时还要在十位上加上1.(五入)如:567≈570出现“大约”“可能”“大概”时,就需要估算,要用“≈”符号。
【典型举例】1.估数。
295≈1002≈889≈1989≈4051≈2. 估一估,比大小。
在○里填上“>” 、“<”或“=”。
378+201 500740+120 900【估算部分】要求:能够结合具体情境,进行加、减法的估算,培养学生的估算意识。
建议:1、运用估算解决问题的同时,注意培养良好的审题习惯,渗透解题的技巧。
例如:数学书第101页第12题2、能结合实际进行估计。
如:估钱例如:计算部分复习建议:1、在鼓励学生多种算法的基础上,注意算法的优化。
缺乏方法优化的意识,口算的正确率和熟练程度总是无法提高。
2、针对难点设计一些单项的练习:如:判断得数的十位上是几37+54=15+65=53+36=70-26=66-34=3、部分学生20以内进位加退位减不熟,也是造成后面口算出错的根源,还要加强训练。