2019年襄阳四中、五中自主招生模拟试题五
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2018-2019年最新襄阳市第四中学自主招生考试英语模拟精品试卷(第一套)考试时间:120分钟总分:150分第I卷(选择题,共100分)第一节:单项填空(共25小题,每小题1分,满分25分)1. —When did the terrible earthquake in YaNan happen?—It happened ________ the morning of April 20, 2013.A. onB. atC. inD. /2. Our teacher told us ________ too much noise in class.A. to makeB. makeC. not to makeD. not make3. Here is your hat. Don’t forget______ when you __________.A. to put it on, leaveB. to wear it, leaveC. to wear it, will leaveD. putting it on, will leave4. The baby is sleeping. You _____ make so much noise.A. won’tB. mustn’tC. may notD. needn’t5. Since you are _____ trouble, why not ask _________ help?A. in, forB. in, toC. with, forD. with, to6. It’s about___________kilometers from Nanchong to Chengdu.A. two hundredsB. two hundreds ofC. two hundredD. two hundred of7. It is six years since my dear uncle ________China.A. leftB. has leftC. is leftD. had left8. —How long _______ you _______ the bicycle?—About two weeks.A. have, hadB. have, boughtC. did, buyD. have, have9. The Yellow River is not so ________ as the Yangtze River.A. longerB. longC. longestD. a long10. Mrs.Green usually goes shopping with ________ umbrella in ________ summer.A. a;theB. an; /C. the; aD. /;/11. At first, I was not too sure if he could answer the question. However, ____,he worked it out at last with the help of his friend.A. to my angerB. to my surpriseC. in other wordsD. ina word12. —Must I stay here with you?—No, you ______.You may go home, but you _____ go to the net bar (网吧).A. mustn't; needn'tB. needn't; mustn'tC. must; needD. need; must13. I ______ the newspaper while my mother _____TV plays yesterday evening.A. was reading; was watchingB. was reading; watchedC. read; was watchingD. read; would watch14. It's a rule in my class that our classroom ________ before 6:00 p. m.every day.A. be able to cleanB. should be cleaningC. must cleanD. must be cleaned15. —Tom wants to know if you ________ a picnic next Sunday.—Yes. But if it ________, we'll visit the museum instead.A. will have; will rainB. have; rainsC. have; will rainD. will have; rains16.—Would you mind looking after my dog while I'm on holiday?—________.A. Of course notB. Yes. I'd be happy toC. Not at all. I've no timeD. Yes, please17. Many students didn’t realize the importance of study _______they left school.A. whenB. untilC. afterD. unless18. My father _______ to Shanghai. He _______ for over 2 months.A. has been, has leftB. has gone, has goneC. has gone, has been awayD. has been, has gone19. They are your skirts. Please __________.A. put it awayB. put out itC. put them awayD. put them out20. —Please read every sentence carefully. you are,mistakes you’llmake.—Thank you for your advice.A. The more carefully; the fewerB. The more careful; the lessC. The more carefully; the lessD. The more careful; the fewer21. My friend is coming today but he didn’t tell me _______.A. when did the train arriveB. how did the train arriveC. when the train arrivedD. how the train arrived22. I felt it hard to keep up with my classmate s. But whenever I wantto _______, my teacher always encourages me to work harder.A. go onB. give upC. run awayD. give back23. —________ fine weather it is today!—Let's go for a picnic.A. WhatB. HowC. What aD. How a24.— Mary, you’re going to buy an apartment here, aren’t you?—Yes, but I can’t_______an expensive one.A. spendB. costC. payD. afford25. —Would you like to drink coffee or milk?—_________. Please give me some tea.A. NeitherB. BothC. EitherD. None第二节:完形填空(共20小题,每小题1分,满分20分)(A)Big schoolbags have been a serious problem for students for a long time.Maybe your schoolbag is too __26__ to carry, and it troubles you a lot __27__ you want to find a book out to read. Now an etextbook will __28__ you.It is said that etextbooks are going to be __29__ in Chinese middle schools.An etextbook, in fact, is a small __30__ for students.It is much __31__ than a usual schoolbag and easy to carry. Though it is as small as a book, it can __32__ all the materials (材料) for study.The students can read the text page by page on the __33__, take notes with the pointer (屏写笔). Or even “__34__” their homework to their teachers by sending emails. All they have to do is to press a button.Some people say etextbooks are good, but some say they may be __35__ for the students' eyes. What do you think of it?26.A.light B. heavy C. useful D. comfortable27.A.till B. after C. before D. when28.A.trouble B. prevent C. help D. understanded B. kept C. invented D. lent B. radio C. pen D. computer31.A.heavier B. lighter C. cheaper D. brighter32.A.hold B. build C. discover D. practice33.A.blackboard B. desk C. screen D. card34.A.find out B. hand in C. get back D. give back35.A.helpful B. famous C. good D. bad(B)Food is very important. Everyone needs to _36_ _well if he/she wants to have a strong body. Our minds also need a kind of food. This kind of food is__ 37 __.We begin to get a knowledge even when we are very young. Small children are __38__ in everything around them. They learn __39 __while they are watching and listening. When they are getting older, they begin to ___ 40__ story books, science books…anything they like. When they find something new, they have to ask questions and__41___ to find out the answers.What is the best ___42___to get knowledge? If we learn___43___ourselves, we will get the most knowledge, If we are__44___getting answers from others and don’t ask why, we will never learn more and understand___45_.36. A. sleep B. read C. drink D. eat37. A. sport B. exercise C. knowledge D. meat38. A. interested B. interesting C. weak D. meat39. A. everybody B. something C. nothing D. anything40. A. lend B. write C. think D. read41. A. try B. wait C. think D. need42. A. place B. school C. way D. road43. A. in B. always C. to D. by44. A. seldom B. always C. certainly D. sometimes45.A.harder B. much C. well D. better第三节:阅读理解(共25小题,每小题2分,满分50分)AFamous Museums_______ .A. BeijingB. LondonC. New YorkD. The USA47. New York Museum is America’s largest museum on American__________.A. areaB. historyC. collectionsD. buildings48. The Palace Museum. Which is in the center of Beijing, is also called“Forbidden City(紫禁城)” in China. It lies in __________.A.Chang’an StreetB. New Oxford StreetC. BerlingD. Chestnut Street49. According to the form, if you want to see ancient Chinese collections,you can visit ____ at most.A. one museumB. two museumsC. three museumsD. four museums50. Which of the following is TRUE according to the information above?A. Each ticket for the Palace Museum costs the same in the whole year.B. You don’t have to pay for tickets if you visit New York Museum on Monday.C. British Museum lies in Chestnut street, London.D. New York Museum is the largest in the world.BIn recent years, more and more people like to keep pets such as a dog, a cat, a monkey and other animals. But usually people would accept tame(温顺的) and loyal(忠诚的) animals as pets rather than dangerous ones such as a lion,a tiger or a snake.People love pets and take good care of them. The owners usually regard pets as good friends and some even consider them as members of the family. Although they are not human beings(人类), their behavior sometimes is better than human beings, for they are always loyal to their owners. There are always many stories about brave and smart pets. We often hear that a pet dog saved the owner's life or traveled thousands of miles to return home. Such stories often make pets more lovely.Some pets can also be trained to help people with some special work. For example, trained dogs can help the blind to walk and trained dogs and pigs can even help police to find where drugs are easily.But pets are sometimes trouble-makers. Some pets like dogs or snakes may hurt people without any warning. Some people may become ill after being hurt because of the virus carried by the pets. If they are not taken good care of, they will become very dirty and easily get ill. So pets are helpful to us but keeping pets is not an easy job.51. What animals are thought to be dangerous as pets?A. Cats.B. Dogs.C. Snakes.D. Monkeys52. Which of the following statements is TRUE about pets?A. All the pets are considered as family members.B. Pets always behave better than human beings.C. Sometimes some pets can protect their owners.D. Pets like traveling far away from home.53. Why do people train pets according to the passage?A. To make them more clever.B. To make them more lovely.C. To find drugs for the blind.D. To do some special work.54. What can we learn from the last paragraph?A. Pets often hurt strange people.B. Pets can live well with the virus.C. Pets are dirty and dangerous.D. Pets should be looked after well.55. What is the best title for the passage?A. Training Pets.B. Keeping Pets.C. Cleaning Pets.D.Loving Pets.CFrom Feb. 8 to Mar. 1 is our winter holiday. I think everybody did a lot in the holiday. But it seems that I did nothing and it was my most unlucky holiday.I spent a lot of time on my homework. Every morning my mother woke me up early and I had breakfast in a hurry. Then I had to do my homework almost the whole day! I’m not a very slow person but the homework was too heavy!I was also unlucky when playing. During the Spring Festival, I played fireworks but my finger was hurt because I was careless to light the fireworks. I began to fear playing with fireworks from then.I was still unlucky on my friend’s party. On my friend’s birthday, unusually I woke up at 10:50 because my parents went to visit my grandmother early in the morning. The party would start in 10 minutes! So I hurried to my friend’s home without breakfast. I returned very late that day and when I got home, my parents were very angry with me.Another worrying thing was my weight. Last term, I was 46 kg but nowI am 51 kg! I have to consider losing weight!56. How long did the winter holiday last?A. two monthsB. one monthC. 4 weeksD. 22 days57. The writer got up early every day during the holiday because ______.A. he had to finish homeworkB. he had to have breakfastC. he was a very slow personD. his mother was in a hurry58. He hurt his finger because of ________.A. the Spring FestivalB. his carelessnessC. the light of fireworksD. his fear of playing59. Why were the writer’s parents angry with him?A. Because he got up too late.B. Because he missed breakfast.C. Because he was late for the party.D. Because he came back home too late.60. What did the writer want to tell us in the passage?A. He had an unlucky holiday.B. He had too much homework.C. His parents were very strict.D. He planned to lose weight.DSteven Jobs, the designer of Apple Computer, was not clever when he was in school.At that time, he was not a good student and he always made troubles with his schoolmates.When he went into college, he didn't change a lot.Then he dropped out.But he was full of new ideas.After he left college, Steven Jobs worked as a video game designer.He worked there for only several months and then he went to India.He hoped that the trip would give him some new ideas and give him a change in life.Steven Jobs lived on a farm in California for a year after he returned from India.In 1975, he began to make a new type of computer.He designed the Apple Computer with his friend in his garage.He chose the name “Apple” just because it could help him to remember a happy summer he once spent in an apple tree garden.His Apple Computer was such a great success that Steven Jobs soon became famous all over the world.61.Steven Jobs was not a good student in school because he ________.A. never did his lessonsB. was full of new ideasC. always made troubles with his schoolmatesD. dropped out62.Did Steven Jobs finish college?A. Yes, he did.B. No, he didn't.C. No, he didn't go into college.D. We don't know.63.Steven Jobs designed his new computer ______.A. in IndiaB. with his friendC. in a pear tree gardenD. by himself64.Steven Jobs is famous for his ________ all over the world.A. new ideasB. appleC. Apple ComputerD. video games65.From this passage we know ________.A. Steven Jobs didn't finish his studies in the college because he hatedhis schoolmatesB. Steven Jobs liked traveling in India and CaliforniaC. Steven Jobs liked trying new things and making new ideas become trueD. Steven Jobs could only design video gamesEIf you go into the forest with friends, stay with them. If you don't, you may get lost. If you get lost, this is what you should do. Sit down and stay where you are. Don't try to find your friends. Let them find you. You can help them find you by staying in one place. There is another way to help your friends or other people to find you. You can shout or whistle (吹口哨) three times. Stop. Then shout or whistle three times again. Any signal given three times is a call for help.Keep up shouting or whistling. Always three times together. When people hear you, they will know that you are not just making a noise for fun. They will let you know that they have heard your signal. They will give you two shouts or two whistles. When a signal is given twice, it is an answer to a call for help.If you don't think that you will get help before night comes, try to make a little house with branches .Make yourself a bed with leaves and grass.When you need some water, you have to leave your little branch house to look for it. Don't just walk away .Pick off small branches and drop them as you walk in order to go back again easily.66.If you get lost in the forest, you should ________.A. walk around the forest to find your friendsB. stay in one place and give signalsC. climb up a tree and wait for your friends quietlyD. shout as loudly as possible67.Which signal is a call for help?A. Shouting one time as loudly as you can.B. Crying twice.C. Shouting or whistling three times together.D. Whistling everywhere in the forest.68.When you hear two shouts or two whistles, you know that ________.A. someone finds something interestingB. people will come and help youC. someone needs helpD. something terrible will happen69.Before night comes, you should try to make a little house with ________.A. stoneB. earthC. leaves and grassD. branches70.Which of the following is the best title?A. Getting Water in the ForestB. Spending the Night in the ForestC. Surviving (生存) in the ForestD. Calling for Help in the Forest 第四节:补全对话,从方框内7个选项中选择恰当的5个句子完成此对话(共5分)John: Hi, Karl. You were not here, in your class yesterday afternoon. What was wrong?Karl: 71________John: Sorry to hear that.72Karl: Much better. The fever is gone. But I still cough and I feel weak. John: 73Karl: Yes, I have. I went to the doctor’s yesterday afternoon. The doctor gave me some medicine and asked me to stay in bed for a few days. John: 74Karl: Because I’m afraid I’ll miss more lessons and I’ll be left behind. John: Don’t worry. Take care of yourself. 75第Ⅱ卷(非选择题,共50分)一、根据句意及所给提示,补全单词或用单词、固定短语、固定搭配的正确形式填空(10分)76. Many athletes won gold medals in the Olympics, they are our national h_____.77. Tom didn’t finish _____________( write) his test because he ran out of the time.78. The girl is making a model doll ___________ (care).79. The boy felt __________(困倦的) in class because he stayed up late last night.80. So Terrible! The airplane ______________(起飞) five minutes ago.81.I don't think students should be(允许)to bring mobile phones to school.82.I find it useless to spend much time(解释)it to him.83. She prefers keeping silent to(争吵)with others.84. It is important for us to be(有信心的)of doing everything.85. The doctor operated on the patient(成功)yesterday.二、汉译英, 一空一词(共5小题,每小题2分,计10分)86. 他默默地在雨中行走,浑身上下都被淋湿。
2019年湖北省襄阳四中、五中自主招生化学模拟试卷1一、选择题(共12小题,每小题2分,满分24分)1.(2分)生活在密闭狭小的特殊环境(如潜艇、太空舱)里,O2会越来越少,CO2会越来越多,因此将CO2转化为O2,不仅有科学意义也有重要的实用价值.据科学文献报道,NiFe2O4在一定条件下既能促进CO2分解又可重复使用.NiFe2O4在此反应中是()A.粘合剂B.制冷剂C.防腐剂D.催化剂2.(2分)经测定,一瓶气体中含有碳、氢两种元素,则这瓶气体不可能是()A.一种化合物B.两种化合物C.两种单质D.一种单质和一种化合物的混合物3.(2分)钴(Co)的化合物在锂电池中有很好的应用,LiCoO2(钴酸锂)在酸性介质中有强氧化性,其化学方程式为:2LiCoO2+H2O2+3H2SO4═Li2SO4+2CoSO4+4H2O+O2↑,已知锂与钠有相似的化学性质,且反应中只有钴和氧元素的化合价发生了改变,则下列说法正确的是()A.该反应是复分解反应B.该反应中钴的化合价由+3价变为+2价C.该反应中氧的化合价降低D.钴酸根离子式CoO32﹣4.(2分)“绿色化学”要求原料物质中所有的原子完全被利用,全部转入期望的产品中,即原子利用率为100%.由C2H4(乙烯)合成C4H8O2(乙酸乙酯)的过程中,为使原子利用率达到100%,在催化剂作用下还需加入的物质是()A.HCOOH B.H2O和CO2C.O2和H2O D.O25.(2分)实验室需要把烧杯A中的氢氧化钠溶液转移到烧杯B中,将烧杯A内的液体倒入烧杯B后,烧杯A内会残留约1mL液体,之后用19mL蒸馏水清洗烧杯A的内壁,这部分液体也倾倒至烧杯B,烧杯A内仍残留约1mL液体…需要几次这样的清洗,才能保证原烧杯中的氢氧化钠溶液99.9%都被转移至新烧杯()A.2次 B.3次 C.4次 D.5次6.(2分)如图为A物质的溶解度曲线。
M、N两点分别表示A物质的两种溶液。
2019年襄阳四中、五中自主招生考试语文试题考试时间:60分钟试卷满分:100分一、语言文字运用(每小题5分,共25分)1.下列各句中,加点的成语使用恰当的一项是()A.风光优美的田园,总是令无数人向往。
那里的叠翠青山、淙淙流水、滚滚麦浪、瓜田李下....,给人以深深的美感。
B.在学习诗歌时,我们不能只是简单地停留在对诗句评头论足....的阶段,还应注意研究诗人的人生经历和思想变化轨迹。
C.十年来,他笔耕不辍,文风逐渐形成。
他的这篇随笔如行云流水....,一气呵成。
D.襄阳市政府为陈老巷修复提供规划指导的消息刚一传出,人们就拍手称快....,奔走相告。
2.下列句子没有语病的一项是()A.张校长对极少数欺负同学、无理取闹、甚至打架斗殴的事件,及时进行了批评教育和严肃处理。
B.春耕时节,各地农民抢抓农时播种小麦,田间地头随处可见辛勤耕耘的身影。
好一派繁忙的景象!C.培养具有创新精神的人才,不仅是关系到国家发展、社会进步的大事,更是教育战线的重要任务。
D.近期,手机应用过度索权的问题被广泛引起关注。
许多手机应用都会要求开启相应权限来保证应用的正常运行,这无形中让手机隐私被众多应用入侵。
3.填入下面横线上的句子,与上下文衔接最恰当的一项是()《知否》剧中配角盛大娘子的扮演者刘琳凭借出色的表演成为一部戏的“流量担当”,引起大众关注。
按照戏份和角色设定来看,配角只是走走过场的功能性人物,有些演员并不看重,敷衍了事。
但这些角色到了敬业、专业的演员手里,也能被演绎得深入人心。
他们并不觉得角色无关紧要,就产生怠慢心理,而是认真揣摩、用心演绎,尽量将配角诠释得不夸张、生活化。
这些努力终究会被大家看见。
所以说“____________________,____________________”。
每一个角色都重要,只有每一个演员都发挥好了,整出戏才可能好看。
A.没有小角色,没有小演员B.没有小演员,没有小角色C.没有小角色,只有小演员D.没有小演员,只有小角色4.下列有关古代文化常识的表述,不正确的一项是()A.“燕子来时新社”中“新社”指春社日,时间在立春后,清明前,是古时祭祀谷神以祈丰收的节日。
2019 年襄阳四中、五中自主招生考试数学试题一、选择题 (每题 5 分,合计 50 分)1.以下运算结果中正确的选项是1 x23A. 2x3? 1 x7B. x3 1 x 1 x2x 142C. a22a 1 a 1D.27x3的立方根是 3x2.直线y a2 x m21(此中a、m是常数)必定不经过的象限是A.第一象限B.第二象限C.第三象限D.第四象限3.依据以下三视图 ,计算出该几何体的表面积是A.36 πB.34 πC.30 πD.40π4.我国古代数学著作《孙子算经》中有“鸡兔同笼”问题,“今有鸡兔同笼 ,上有三十五头 ,下有九十四足 ,问鸡兔几何” ,问鸡、兔的只数分别是A.21,14B.22,13C.23,12D.24,115.如图 ,正方形 ABCD 对角线交于一点O,又 O 是正方形A1B1C1O的一个极点 ,并且两个正方形的边长相等都为 a ,正方形A1B1C1O绕O在转动,则两正方形重叠部分的面积为A.不确立B. 1a2 C.1a2 84D. 1a266.在直角坐标系中 ,一束光芒经过点A(3,2),先后经过x轴、y轴反射后再经过点 B(1,4),则光芒从 A 到 B 经过的路线长为A.5B.2 13C.2 5D.2 67.以下五个图像中 ,能表示y是x的函数的图像的个数是A.1个B.2个C.3 个D.4 个8.如图 ,直线x a 从左往右运动,将△ABC分红左右两部分,左侧暗影部分的面积为 S,则 S 对于a的函数图像是9.有以下四个命题 :①若 x24,则x2;②若24则 x 1 ;2x14x2,2 1③命题“若 am2>bm2,则 a> b ”的抗命题;④若一元二次方程ax2bx c 0 的两根是1 和 2,则方程cx2bx a0 的两根是-1和12此中真命题的个数是A.1 个B.2 个C.3 个D.4 个10.函数y x2 1 x 2 3 x 0 的最小值与最大值分别是A.3,9B. 3 ,9C.1,9D.3,104二、填空题 (每题 5 分,合计 30 分)11.函数y x2x0 2 x 中自变量x的取值范围是___________.x112. 423 27 4 2 3 4 2 3_________.13.方程x2x10 的较大的根为 a , a 的小数部分为 b ,则 a2b2ab______.14.⊙O 的内接梯形 ABCD ,AB 过点 O,AB ∥CD ,AC 交 BD 于 E,OD 交 AC 于 F,AB=10 ,∠ DAB=60 °,则 EF=____________.15.二次函数y x 22x m 与x轴有两个不一样的交点A、B, 现有以下四个命题 :① m 的取值范围是m<1;②A、B 的距离AB 2 1 m;③若 m15,当 y>0 时,x的取值范围是 x< 3 或x>5;④点 C 2,5m m> 5 ,△ABC的面最大 3.此中正确命的序号是________________.16.如所示 ,在直角坐系中的整点 (横坐整数 ):b1 1,0, b2 1, 1, b3 0, 1 ,b41, 1 ,b51,0 , b61,1, b70,1, b8 1,1, b9 2,1 ,⋯,以此推 , b2018【参照公式:1 23n1n n 1). ________2三、解答 (共 70 分)17.(6 分)已知14,求 a 1的.aa a18.(6 分)化境 ,引一批同的 ,三年后 ,些的干的周状况如所示 :(1)批共有 ________棵;(2)批干周的中位数在第________ (从左到右 );(3)从批数据中任取一个,落在 50~60 一的概率 __________;(4)求批干周的均匀数。
2019年襄阳四中、五中自主招生考试化学试题考试时间:60分钟试卷满分:100分可能用到的相对原子质量:H:1 C:12 N:14 O:16 Na:23 Mg:24 S:32 Cl:35.5 K:39 Ca:40Fe:56 Cu:64 Zn:65 Ag:108第Ⅰ卷(选择题共48分)一、选择题(每小题只有一个选项符合要求,每小题3分,共48分)1.下列解释不科学的是A.在溶洞中,当溶有Ca(HCO3)2的水溶液发生分解,析出固体(在洞顶或洞底),日久天长便形成了钟乳石B.长期盛放NaOH溶液的试剂瓶不易打开,是因为NaOH与瓶中的CO2反应导致瓶内气压小于瓶外大气压的缘故C.“通风橱”是利用排风扇将橱内废气直接排放到室外的装置,它是一种不完善的防污设施D.把石油经蒸馏分离成为汽油、煤油和柴油等,是利用了石油中各成分的沸点不同2.原子的核电荷数小于18的某元素x,其原子的电子层数为n,最外层电子数为2n+1,原子核内质子数是2n2-l。
下列有关x的说法中不正确的是A.X能形成化学式为X(OH)3的碱B.X可能形成化学式为KXO3的含氧酸钾盐C.X原子的最外层电子数和核电荷数肯定为奇数D.X能与某些金属元素形成化合物3.已知下列物质的名称分别是名称硫代硫酸钠多硫化钙过氧化钡超氧化钾化学式Na2S2O3CaS x BaO2KO2根据上述命名规律回答:K2CS3应命名为A.三硫代碳酸钾B.多硫碳酸钾C.过硫碳酸钾D.超硫碳酸钾4.为了除去粗盐中的Ca2+、Mg2+、SO42-及泥沙,可将粗盐溶于水,然后进行下列五项操作。
正确的操作顺序是:①过滤,②加过量的NaOH溶液,③加适量盐酸,④加过量Na2CO3溶液,⑤加过量BaCl2溶液A.④②⑤①③B.④⑤②①③C.⑤④①②③D.⑤④②①③5.“三效催化转换器”可将汽车尾气中的有毒气体处理为无污染的气体,下图为该反应的微观示意图(未配平),其中不同符号的球代表不同种原子。
第一套:满分120分2020-2021年襄阳市第四中学初升高自主招生数学模拟卷一.选择题(共6小题,满分42分)1. (7分)货车和小汽车同时从甲地出发,以各自的速度匀速向乙地行驶,小汽车到达乙地后,立即以相同的速度沿原路返回甲地,已知甲、乙两地相距180千米,货车的速度为60千米/小时,小汽车的速度为90千米/小时,则下图中能分别反映出货车、小汽车离乙地的距离y (千米)与各自行驶时间t (小时)之间的函数图象是【 】A. B. C. D.2. (7分)在平面直角坐标系中,任意两点规定运算:①;②;③当x 1= x 2且y 1=y 2时,A =B.有下列四个命题:(1)若A (1,2),B (2,–1),则,; (2)若,则A =C ; (3)若,则A =C ;()()1122,,,A x y B x y ()1212,⊕=++A B x x y y 1212=⊗+A B x x y y (),31⊕= A B 0=⊗A B ⊕=⊕A B B C =⊗⊗A B B C(4)对任意点A 、B 、C ,均有成立. 其中正确命题的个数为( )A. 1个B. 2个C. 3个D. 4个 3.(7分)如图,AB 是半圆直径,半径OC ⊥AB 于点O ,AD 平分∠CAB 交弧BC 于点D ,连结CD 、OD ,给出以下四个结论:①AC ∥OD ;②CE=OE ;③△ODE ∽△ADO ;④2CD 2=CE •AB .正确结论序号是( )A .①②B .③④C .①③D .①④ 4. (7分)如图,在△ABC 中,∠ACB =90º,AC =BC =1,E 、F 为线段AB 上两动点,且∠ECF =45°,过点E 、F 分别作BC 、AC 的垂线相交于点M ,垂足分别为H 、G .现有以下结论:①;②当点E 与点B 重合时,;③;④MG •MH =,其中正确结论为( )A. ①②③B. ①③④C. ①②④D. ①②③④ 5.(7分)在数学活动课上,同学们利用如图的程序进行计算,发现无论x 取任何正整数,结果都会进入循环,下面选项一定不是该循环的是( )A. 4,2,1B. 2,1,4C. 1,4,2D. 2,4,1 6. (7分)如图,在矩形ABCD 中,AB =4,AD =5,AD 、AB 、BC 分别与⊙O 相切于E 、F 、G 三点,过点D()()⊕⊕=⊕⊕A B C A B C 2AB =12MH =AF BE EF +=12作⊙O 的切线交BC 于点M ,则DM 的长为( )A.B. C. D.二.填空题(每小题6分,满分30分)7.(6分)将边长分别为1、2、3、4……19、20的正方形置于直角坐标系第一象限,如图中方式叠放,则按图示规律排列的所有阴影部分的面积之和为 . 8.(6分)如图,三个半圆依次相外切,它们的圆心都在x 轴上,并与直线3y x =相切.设三个半圆的半径依次为r 1、r 2、r 3,则当r 1=1时,r 3= .9.(6分)如图,将一块直角三角板OAB 放在平面直角坐标系中,B (2,0),∠AOB=60°,点A 在第一象限,过点A 的双曲线为k y x=.在x 轴上取一点P ,过点P 作直线OA 的垂线l ,以直线l 为对称轴,线段OB 经轴对称变换后的像是O ´B ´.(1)当点O ´与点A 重合时,点P 的坐标是 ;(2)设P (t ,0),当O ´B ´与双曲线有交点时,t 的取值范围是 .1339241332510.(6分)如图,正方形A 1B 1P 1P 2的顶点P 1、P 2在反 比例函数2(0)y x x=>的图象上,顶点A 1、B 1分别在x 轴、y 轴的正半轴上,再在其右侧作正方形P 2P 3A 2B 2,顶点P 3在反比例函数2(0)y x x=>的图象上,顶点A 2在x 轴的正半轴上,则点P 3的坐标为 .11.(6分)如图,在⊙O 中,直径AB ⊥CD ,垂足为E ,点M 在OC 上,AM 的延长线交⊙O 于点G ,交过C 的直线于F ,∠1=∠2,连结CB 与DG 交于点N .若点M 是CO 的中点,⊙O 的半径为4,cos ∠BOC=41,则BN= .三.解答题(每小题12分,满分48分)12.(12分)先化简,再求值:, 其中.13.(12分)如图,点A (m ,m +1),B (m +3,m -1)都在反比例函数的图象上.(1)求m ,k 的值;32221052422x x x x x x x x --÷++--+-2022(tan 45cos30)21x =-+︒-︒-xky =xO yAB (2)如果M 为x 轴上一点,N 为y 轴上一点, 以点A ,B ,M ,N 为顶点的四边形是平行四边形,试求直线MN 的函数表达式. (3)将线段AB 沿直线进行对折得到线段,且点始终在直线OA 上,当线段与轴有交点时,则b 的取值范围为 (直接写出答案)14.(12分)如图,在Rt △ABC 中,∠ABC=90°,以AB 为直径作⊙O 交AC 于点D ,DE 是⊙O 的切线,连接DE .(1)连接OC 交DE 于点F ,若OF=CF ,证明:四边形OECD 是平行四边形; (2)若=n ,求tan ∠ACO 的值b kx y +=11B A 1A 11B A x OFCF15.(12分)如图1,抛物线y =ax 2+bx +c (a ≠0)的顶点为C (1,4),交x 轴于A 、B 两点,交y 轴于点D ,其中点B 的坐标为(3,0)。
2019年襄阳四中、五中自主招生考试英语试题考试时间:60分钟试卷满分:100分第一部分:基础知识(共两节, 满分20分)做题时,先将答案标在试卷上。
然后将试卷上的答案转涂到答题卡上。
第一节:语法(共10小题;每小题1分, 满分10分)1. Alice and Jane were both born in________1970s in the countryside, so there is________ uncommon similarity between the two.A. /, a.B. the, aC. /, /D. the, an2. Experts think the water in this city is faced with serious environmental challenges and will be further polluted unless some effective measures________.A. will be takenB. are takenC. were takenD. had been taken3. Frightened in the dark street, she hurried home, never once looking back to see if she _______.A. was been followedB. was being followedC. had been followedD. has been followed4. Captain John Smith was among the first to settle in ________is called New England now.A. whatB. whichC. the place whereD. where5. He expressed his thanks to the teachers and classmates again and again, without ________ help, he couldn’t have been so successful.A. theirB. whoseC. whomD. that6. To his mother’s delight, ________ he took part in the English competition, he won the second prize.A. for the first timeB. the first timeC. at a timeD. at one time7. ---How long do you suppose it is ________ he left for Japan?---No more than half a month.A. thatB. beforeC. afterD. since8. It is usually warm in Xiangyang in April, but sometimes it ________be rather cold.A. mustB. canC. shouldD. would9. From Mum’s love, patience and understanding, I’ve learned what a huge responsibility ________is to raisea child.A. thisB. thatC. itD. /10. I do hope you benefit from doing exercise and balanced diet, because I want you to live ______as I have.A. as a healthy lifeB. as healthy a life.C. as healthily a lifeD. so healthy life第二节:词汇(共10小题;每小题1分,满分10分)11. Tourists should have good ______while travelling abroad because they represent the image of the country.A. politenessB. mannersC. respectD. behavior 12. High-speed trains, Alipay(支付宝), shared bikes and online payment are seen as the new Four Great________ of China by foreigners.A. CreationsB. InvitationsC. AchievementsD. Discoveries13. You have to continue learning a lot of information and improving if you want to ________the timesA. get along withB. keep in touch withC. come up withD. keep up with14. It was beyond her expectation that she ________ an old friend of her yesterday while she was shopping ata supermarket.A. brought aboutB. showed upC. came acrossD. focused on15. From the present box office of the new movie, it ________to be one of the biggest money-makers of thisyear.A. promisesB. supposesC. plansD. suggests16. They have ________us $750,000 for the house, which I think is a good price for it.A. providedB. suppliedC. offeredD. afforded17. The warmer a place is, ________ speaking, the more types of plants and animals it will usually support.A. honestlyB. generally C traditionally D. practically18. If you decide to do your own make-up, here is some ________ advice that will help you look your best.A. typicalB. valuableC. worthD. expensive19. A special activity was held ________ those firefighters who lost their lives to put out the forest fire inSichuan province.A. in terms ofB. in favour ofC. in need ofD. in memory of20. No progress was made in the trade talk because neither side would ________ to ________.A. give up, othersB. give in, otherC. give way, the otherD. give away, another第二部分:阅读理解(共两节, 满分40分)第一节:(共15小题; 每小题2分, 满分30分)阅读下列短文, 从每题所给的四个选项(A 、B 、C 和D )中, 选出最佳选项, 并在答题卡上将该项涂黑。
2018-2019年最新襄阳市第四中学自主招生语文模拟精品试卷(第一套)(满分:100分考试时间:90分钟)③小屋在山的怀抱中,犹如在花蕊中一般,慢慢地花蕊绽开了一些,好像山后退了一些。
④当花瓣微微收拢,那就是夜晚来临了。
⑤小屋的光线既富于科学的时间性,也富于浪漫的文学性。
A.①③②④⑤ B.①④③②⑤ C.⑤③②①④ D.⑤③②④①二、阅读下面古诗文,完成7—14题。
(24分,7—12每题2分)勾践自会稽归七年,拊循其士民,欲用以报吴。
大夫逄同谏曰:“今夫吴兵加齐、晋,怨深于楚﹑越,名高天下,实害周室,德少而功多,必淫自矜。
为越计,莫若结齐,亲楚,附晋,以厚吴。
吴之志广,必轻战。
是我连其权,三国伐之,越承其弊,可克也。
”勾践曰:“善。
”其后四年。
吴士民罢弊,轻锐尽死于齐﹑晋。
而越大破吴,因而留围之三年,吴师败,越遂复栖吴王于姑苏之山。
吴王使公孙雄肉袒膝行而前,请成越王曰:“孤臣夫差敢布腹心,异日尝得罪于会稽,夫差不敢逆命,得与君王成以归。
今君王举玉趾而诛孤臣,孤臣惟命是听,意者亦欲如会稽之赦孤臣之罪乎?”勾践不忍,欲许之。
范蠡曰:“会稽之事,天以越赐吴,吴不取。
今天以吴赐越,越其可逆天乎?且夫君王蚤朝晏罢,非为吴邪?谋之二十二年,一旦而弃之,可乎?且夫天与弗取,反受其咎。
君忘会稽之厄乎?”勾践曰:“吾欲听子言,吾不忍其使者。
”范蠡乃鼓进兵,曰:“王已属政于执事,使者去,不者且得罪。
”吴使者泣而去。
勾践怜之,乃使人谓吴王曰:“吾置王甬东,君百家。
”吴王谢曰:“吾老矣,不能事君王!”遂自杀。
选自《史记·越王勾践世家》7.下列加点词语解释不正确的一项是( )A.越承其弊,可克也。
克:战胜 B.越遂复栖吴王于姑苏之山 栖:占领C.越其可逆天乎 逆:违背 D.吾老矣,不能事君王 事:侍奉8.下列加点词语古今意义相同的是( )A.今天以吴赐越 B.使者去,不者且得罪 C.谋臣与爪牙之士,不可不养而择也 D.微夫人之力不及此三、现代文阅读(14分) 大度读人 一个人就是一本书。
襄阳四中五中自主招生考试数学试题襄阳四中五中自主招生考试模拟试题一、选择题(每小题6分,共计30分)1.如果a,b,c是正数,且满足a+b+c=9,那么(a/b+b/c+c/a)的值为()A.6B.7C.9D.102.麻云和麻腾每人都有若干面值为整数元的人民币.麻云对麻腾说:你若给我2元,我的钱数将是你的n倍;麻腾对麻云说:你若给我n元,我的钱数将是你的2倍,其中n是正整数,则n的可能值的个数是:()A.1B.2C.3D.43.若质数a,b满足a-9b-4=,则数据a,b,2,3的中位数是()A.4B.7C.4或7D.4.5或6.54.已知(x-x-2)=a/(x+a),则a/(x+a)+a/(x+a)+。
+a/(x+2a)的值为()A.-32B.0C.32D.645.若四个互不相等的正实数a,b,c满足(a^2-c^2)(a^2-d^2)=2012,(b^2-c^2)(b^2-d^2)=2012,则(ab)^2-(cd)^2的值为()A.-2012B.-2011C.2012D.2011二、填空题(每小题5分,共计30分)6.设下列三个一元二次方程:x+4ax-4a+3=0;x+(a-1)x+1+a=0;2x^2+2ax-2a+3=0,至少有一个方程有实根,则a的取值范围是_______________。
7.如图所示,把大正方形纸片剪成五个部分,在分别距离大正方形的四个顶点5厘米处沿45°方向剪开,中间部分正好是小正方形,那么小正方形的面积是___________平方厘米。
8.点A为y轴正半轴上一点,A,B两点关于x轴对称,过点A任作直线交抛物线y=2x^2于P,Q两点.若点A的坐标为(0,1)且∠PBQ=60°,则所有满足条件的直线PQ的解析式为____________________。
9.能使n-1/(n+2009+105)成立的正整数n的值的个数等于一____________。
一、选择题(本大题共10个小题,每小题5分,共50分)在每小题给出的四个选项中,有且只有一项是符合题目要求的1.(5分)下列运算结果中正确的是()A.=a B.(﹣2a2)3=﹣6a6C.a2•a3=a6D.a5÷a3+a2=2a22.(5分)是x1,x2,…,x100的平均数,a是x1,x2,…,x30的平均数,b是x31,x32,…,x100平均数,则下列各式一定正确的是()A.x=B.x=C.x=D.x=a+b3.(5分)若一次函数y=x+k与反比例函数的图象没有公共点,则k的值可以是()A.﹣5B.﹣4C.﹣2D.24.(5分)如图,四边形AODC是边长为1的正方形,平面图形OBD是四分之一圆的扇形,点M在线段AB上,MN⊥AB,且MN交CD或交弧DB于点N,设AM=x(0≤x≤2),图中阴影部分表示的平面图形AMNC(或AMNDC)的面积为y,则y关于x的函数的大致图象是()A.B.C.D.5.(5分)如图,在半径为1,圆心角为直角的扇形OAB中,分别以OA,OB为直径作两个半圆,则图中阴影部分的面积为()A.B.C.D.6.(5分)有下列四个命题:①若a=b,则ac=bc;②若x<y,则x2<y2;③命题“若x2≠4,则x≠2”的逆命题;④若一元二次方程kx2+2x﹣1=0有实数根,则实数k的取值范围是k≥﹣1,其中真命题的个数是()A.0B.1C.2D.37.(5分)在函数y=中,自变量x的取值范围为()A.x≤﹣4或x≥2B.﹣4<x<1且x≠0C.﹣4≤x≤1且x≠0D.﹣4≤x<1且x≠08.(5分)把一枚质地均匀的骰子掷两次,则两次向上的点数之和不小于9的概率是()A.B.C.D.9.(5分)方程x2﹣2x﹣2=0的实数根可视为函数y=x﹣2的图象与函数的图象公共点的横坐标,则方程x3﹣2x﹣1=0的正实数根x0所在的范围是()A.1B.C.D.<210.(5分)如图,已知▱ABCD,AB∥x轴,AB=6,点A的坐标为(1,﹣4),点D的坐标为(﹣3,4),点B在第四象限,点G是AD与y轴的交点,若点P为边CD上一动点,过点P作y轴的平行线PM,过点G作x轴的平行线GM,它们相交于点M,将△PGM沿直线PG翻折,当点M的对应点落在坐标轴上时,则点P的坐标为()A.P(,4)B.P(,4)C.P(,4)D.P(,4)二、填空题(本大题共6个小题,每小题5分,共30分)把答案填在答题卡的相应位置上.11.(5分)=.12.(5分)某几何体的三视图如图所示,则其表面积为.13.(5分)如图,已知菱形ABCD的周长为8,面积为2,E为AB的中点,若P为对角线BD上一动点,记PC﹣PE的最大值为m,记PC+PE的最小值为n,则=.14.(5分)如图,将▱ABCD沿EF对折,使点A落在点C处,若∠A=60°,AD=2,AB=3,则AE的长为.15.(5分)规定:(x)表示不小于x的最小整数,[x]表示不大于x的最大整数,[x)表示最接近x的整数(x≠n+0.5,n为整数),例如:(4.7)=5,[﹣4.7]=﹣5,[4.7)=5,则下列说法正确的是(写出所有正确说法的序号)①当x=2.3时,(x)+[x]+[x)=7;②当x=﹣2.3时,(x)+[x]+[x)=﹣6;③(x+y)≤(x)+(y);④[x﹣y]≤[x]﹣[y].16.(5分)古代数学家研究过各种多边形数.如三角形数1,3,6,10,…,第n个三角形数为=n2+n.记第n个k边形数为N(n,k)(k≥3),则下面给出了部分k边形数中第n个数的表达式:三角形数N(n,3)=n2+n四边形数N(n,4)=n2五边形数N(n,5)=n2﹣n六边形数N(n,6)=2n2﹣n…可以推测N(n,k)的表达式,由此计算N(20,19)=.三、解答题(本大题共8个小题,共70分)解答应写出文字说明,证明过程或演算步骤,并且写在答题卡上每题对应的答题区域内17.(6分)袋子中装有1个红球,2个黄球和3个绿球,这些球的形状、大小、质地等完全相同,即除颜色外无其他差别.在看不到球的条件下,随机从袋子中摸出两个球.(1)求两球颜色为一黄一绿的概率;(2)若摸到红球记1分,摸到黄球记2分,摸到绿球记3分,求得分为4分的概率.18.(6分)如图,AB是⊙O直径,AC是⊙O切线,BC交⊙O于点E.(1)若D为AC中点,求证:DE是⊙O切线;(2)若OA=CE,求tan∠ACB的值.19.(8分)某公司在甲,乙两地销售同一种品牌的手机,在甲地的销售利润(单位:百元)为y1=ax2+6.5x,在乙地的销售利润(单位:百元)为y2=kx,其中x为销售量(单位:部),当x=5时,y1=2y2;当x =35时,y1=y2.(1)求实数a和k的值;(2)若该公司在两地共销售40部该种品牌的手机,求该公司获得的最大销售利润.20.(8分)小明根据学习函数的经验,对函数y=的图象与性质进行了探究,下面是小明的探究过程,请补充完整,并解决相关问题.(1)函数y=的自变量x的取值范围是;(2)当函数值y>0时,自变量x的取值范围是;(3)当1<x<3时,函数y=有最(填“大”或“小”)值,该值为;(4)请根据函数的解析式或结合函数的图象,写出有关函数增减性的两条性质:①②;(5)如果方程=a没有实数解,那么a的取值范围是.21.(10分)如图,点E为正方形ABCD边BC上一动点(不与B,C重合),∠AEF=90°,AE=EF,连接AF交边CD于M,交BC的延长线于N,连接EM、CF,EF交CM于点P.(1)判断线段BE、EM、MD间的数量关系,并证明你的结论;(2)若正方形边长为1,且BE:EC=1:2,求MP和FN的长.22.(10分)已知实数a,b满足a2+b2=1.(1)求t=a﹣b的取值范围;(2)求y=a﹣b+ab﹣1的最大值.23.(10分)已知抛物线y=x2﹣(5k+1)x+6k2+3k.(1)求证:无论k取任何实数,抛物线与x轴总有公共点;(2)如图,若抛物线与x轴正半轴交于B、C两点,与y轴交于点A.是否存在实数k,使得AB=BC,且∠ABC=150°.若存在,求出k的值,若不存在,请说明理由.24.(12分)如图,已知抛物线y=﹣x2+4x+5与x轴交于B、C两点.(1)求抛物线的顶点A的坐标及B,C两点的坐标;(2)在x轴上是否存在一点P,使△P AB为等腰三角形?若存在,求出满足条件的所有点P的坐标;(3)如图,连接AB、AC,点M为线段BC上一动点,过点M作直线MN∥AC交线段AB于点N,求△AMN面积的最大值.。
襄阳四中、五中自主招生考试
数学模拟试题一
考试时间:120分钟 试卷满分:150分 一、选择题:本大题共10小题,每小题5分,共50分.在每小题给出的四个选项中,有且只
有一项是符合题目要求的.
1.下列各式运算结果错误的是( ) A .(
)()
873
22
22b a ab b
a -=-⋅-
B .(
)()
333
23
32b a ab b a =÷-
C .()()
6
63
22
3b a b a
=⋅-
D .()()18183
322
3
b a b a =⎥
⎦
⎤
⎢⎣
⎡-⋅-
2.如图,正方形ABCD 中,E 是BC 边上一点,以E 为圆心,EC 为半径的半圆与以A 为圆心,AB 为半径的圆弧外切,则sin ∠EAB 的值为( ). A .
B .
C .
D .
3.将直线2310x y --=向左平移3个单位,再向下平移5个单位,平移后所得新直线的表达式为( ) A .23180x y --= B.23180x y -+= C .23120x y --=
D.01032=--y x
4.设 a , b , c 是不为零的实数,那么 a b c
x a b c
=
+-的值有( ) A .3种 B .4种 C .5种 D .6种
5.已知ABC ∆的三边长分别为4,4,6,在ABC ∆所在平面内画一条直线,将ABC ∆分割成两个三角形,使其中的一个是等腰三角形,则这样的直线最多可画几条( ) A .3
B .4
C .5
D .6
6.如果015p <<,那么当15p x ≤≤时,代数式1515x p x x p -+-+--的最小值是( ) A .30
B .0
C .15
D .一个与p 有关的代数式
7.如图,在边长为2的菱形ABCD 中, 60A ∠=,点M 是AD 边的中点,连接MC ,将菱形ABCD 翻折,使点A 落在线段CM 上的点E 处,折痕交
AB 于点N ,则线段EC 的长为(
)
A 1
B 1
C 1+
D 1
8.若四边形的一组对边中点的连线的长为d ,另一组对边的长分别为a , b ,则d 与2
a b
+的大小关系是( ) A .2a b d +<
B .2a b d +>
C .2a b d +≤
D .2
a b
d +≥ 9.已知关于x 的不等式组()()23
1122
32x x x x x x a
⎧-++<+-⎪⎨+<⎪⎩恰有三个整数解,则实数a 的取值范围( )
A .814a a <>或
B .1114a ≤<
C .1114a <≤
D .1114a ≤≤
10.中央电视台有一个非常受欢迎的娱乐节目:墙来了!选手需按墙上的空洞造型摆
出相同姿势,才能穿墙而过,否则会被墙推入水池.类似地,有一个几何体恰好无缝隙地以三个不同形状的“姿势”穿过“墙”上的三个空洞,则该几何体为( )
A .
B .
C .
D .
11.已知01a <<,且满足122918303030a a a ⎡
⎤⎡⎤⎡⎤+
+++⋯++=⎢⎥⎢⎥⎢⎥⎣⎦⎣⎦⎣
⎦([]x 表示不超过x 的最大整数),则[]
10a 的值等于( ) A .5
B .6
C .7
D .8
12. 如图,在菱形ABCD 中, 4AB =, 0120A ∠=,点,,P Q K 分别为线
段,,BC CD BD 上的任意一点,则PK QK +的最小值为( ) A .2
B .
C .4
D .2+
二、填空题(本大题共6个小题,每小题5分,共30分)把答案填在答题卡的相应位置上.
13.给出下列命题:
(1)一组对边和一组对角分别相等的四边形是平行四边形; (2)两组对角的内角平分线分别平行的四边形是平行四边形;
(3)一组对边中点间的距离等于另一组对边长和的一半的四边形是平行四边形; (4)两条对角线都平分四边形面积的四边形是平行四边形. 其中正确的是__________.(写出所有正确的编号)
14.若245134x x x +-
+-
+的值恒为常数,则x 该满足的条件是__________.
15.一个正 ABC ∆ 的每一个角各有一只蚂蚁,每只蚂蚁开始朝另一只蚂蚁做直线运动,目标角随机选择,
则蚂蚁不相撞的概率是__________.
16.如图,C 为半圆内一点,O 为圆心,直径AB 长为2cm ,∠BOC=60°,
∠BCO=90°,将△C BOC 绕圆心O 逆时针旋转至△B OC '',点C '在OA 上,则边BC 扫过区域(图中阴影部分)的面积为______cm 2.
三、解答题(本大题共8个小题,共70分)解答应写出文字说明,证明过程或演算步骤,并且写在答题卡上每题对应的答题区域内.
四、17.计算:(1)
()1
01314cos302π-⎛⎫
---- ⎪⎝⎭
.
(2)先化简,再求值:)25
2(6392
2--+÷--a a a a a ,其中a 是方程0542=-+x x 的根. 18.统计学中有两个重要参数平均值和方差,定义n 个数12,,n x x x L 的平均值1211n
n i i x x x x x n n
=+++==∑L ,
方差2222
2
121()()()1()n n i i x x x x x x s x x n n
=-+-++-=-=
∑L 2211()n i i x nx n ==-∑ (1)现有5个数:4,5,6,7,8,求x 及2
s .
(2)若5个数的平均数为5 ,方差为3,现除去其中一个数4,求剩余4个数的平均值和方差.
19.已知函数().33x
f x x
=+
(1)()1;f f x x ⎛⎫
+ ⎪⎝⎭
(2)求()()()()1111234432f f f f f f f ⎛⎫
⎛⎫⎛⎫
++++++ ⎪ ⎪ ⎪⎝⎭⎝⎭⎝⎭
的值.
20.(1)问题发现
如下图,△ACB 和△DCE 均为等边三角形,点A 、D 、E 在同一直线上,连接BE 。
填空:①∠AEB 的度数为____________;
②线段AD 、BE 之间的数量关系是_________。
(2)拓展探究
如下图,△ACB 和△DCE 均为等腰直角三角形,∠ACB=∠DCE=900, 点A 、D 、E 在同一直线上,CM 为△DCE 中DE 边上的高,连接BE 。
请判断∠AEB 的度数及线段CM 、AE 、BE 之间的数量关系,并说明理由。
(3)解决问题
如下图,在正方形ABCD 中,CD=。
若点P 满足PD=1,且∠BPD=900,请直接写出点A 到BP 的距
离。
21.如图所示,Rt △AOB 的直角边OA 在x 轴上,OA=2,AB=1,将Rt △AOB 绕
点O 逆时针旋转90°得到Rt △COD ,抛物线2
56
y x bx c =++经过B 、D 两点.
(1)求二次函数的解析式;
(2)连接BD ,点P 是抛物线上一点,直线OP 把△BOD 的周长分成相等的两部分,求点P 的坐标.
22.如图1,在直角梯形ABCD 中,AD ∥BC ,顶点D ,C 分别在AM ,BN 上运动(点D 不与A 重合,
点C 不与B 重合),E 是AB 上的动点(点E 不与A ,B 重合),在运动过程中始终保持DE ⊥CE ,且AD+DE=AB=a .
(1)求证:△ADE ∽△BEC ;
(2
)设
AE=m
,请探究:△
BEC
的周长是否与m 值有关,若有关请用含m 的代数式表示△BEC 的周长;若无关请说明理由.。