今天给各位同学分享八下调研卷答案的知识，其中也会对八年级下册英语调研卷进行解释，如果能碰巧解决你现在面临的问题，别忘了分享本站，现在开始吧！
本文目录一览：
- 1、八年级下册英语期末考试卷2016（含答案）
- 2、名校调研系列卷八年级下第一次月考语文长春版试卷答案
- 3、鸿儒经典 单元达标重点名校调研卷 八年级华师大版语文(下)
- 4、八年级下册数学测试卷及答案解析
- 5、2011名校调研系列卷八下第三次语文老费的小屋 阅读答案~
- 6、名校调研系列卷每周一考八年级下物理答案
八年级下册英语期末考试卷2016（含答案）
宜昌市2005年八年级下学期英语期末调研考试试题听力部分（25分）I．情景反应：你将听到5个问题，每个问题你将看到供选择的三个答案。请根据你所听到的问句选择适当的答语。听一遍。（共5小题，计5分）1. A. Enjoy yourself. B. It’s a pleasure. C. Good luck.2. A. That’s right. B. Thanks a lot. C. Congratulations!3. A. Good idea. B. Sorry, I won’t do it again. C. It doesn’t matter.4. A. Three years ago. B. About three years. C. Next year.5. A. I can’t. B. I won’t. C. I don’t.II．图片理解。 你将听到一段小故事，请按故事情节给下面的图片排序。听一遍。（共5小题，计5分）6. ____ 7. ____ 8. ____ 9. _____ 10. ____ III．单句理解：请选择与你所听到的句子意思相近的选项。听两遍。（共5小题，计5分）11. A. Both of them are winners in the race. B. Li Lei is running as fast as Jim. C. Li Lei is running faster than Jim.12. A. He didn’t begin to do his homework until 9 o’clock. B. He finished doing his homework before 9 o’clock. C. It took him 2 hours to finish his homework.13. A. Dick’s brother will be an engineer in the future. B. Dick is an engineer now. C. Dick’s brother is an engineer.14. A. It isn’t safe to swim in the deep river. B. Don’t swim in the river. C. The water in the river is too dangerous.15. A. He didn’t have enough money to buy the ticket to the concert. B. He didn’t enjoy listening to the concert. C. He didn’t want to buy the ticket to the concert.IV．对话理解：你将听到几段对话，每段对话后有几个问题。请根据你所听到的对话内容选择适当的答语。听两遍。（共5小题，计5分）听第一段对话，回答16，17小题。16. Where does this dialogue happen A. At home. B. At school. C. In the open air.17. What does Jack like to eat A. A chicken sandwich. B. A tomato sandwich. C. A potato sandwich. 听第二段对话，回答18，19，20小题。18. What’s the dialogue talking about A. About Jim’s school. B. About Jim’s trouble. C. About the food for breakfast.19. Where are they talking A. At Jim’s home. B. At the doctor’s. C. At Jim’s school.20. What’s the matter with Jim A. He’s a headache. B. He’s a cold. C. Both A and B.Ⅴ.短文理解：你将听到一段短文，请根据听到的内容选择正确的答案回答问题，听两遍。（共5小题，计5分）21. When did the children go skating A. After breakfast. B. Before supper. C. After lunch.22. How many children skated on the lake A. Three. B. Four. C. Five. 23. Who skated best of all the children A. Allan did. B. Paul did. C. Bill did. 24. Why did Paul fall into the water A. Because he skated fast. B. Because he was not good at skating. C. Because he didn't know the ice there was broken. 25. Who helped Paul A. His friends. B. His parents. C. Two workers笔试部分VI.单项选择。从每小题所给的四个选项中，选出一个正确答案。(15分)26. ---Would you like to have dinner with us It’s my birthday today. --- _______. A. Yes, I would. Thank you B. I’d love to, thanks. And happy birthday.C. Happy birthday D. Thank you all the same27. --- Lily did badly in the 400-meter race. What about you --- I did _______. A. rather bad B. more badly C. even badly D. much worse28. ---Which ball game do you like better, basketball or baseball --- _______. I love table tennis.A. Both B. Either C. Neither D. Each29. --- Mum, something is wrong with my stomachache (肚子). It hurts badly. --- Don’t worry. I’ll take you to the hospital. But _______.A. eat something until you see the doctorB. don’t eat anything until you see the doctor.C. you can eat nothing after you see the doctor D. you have to eat more than before30. You must look around carefully when you go___________ the road.A. across B. through C. out of D. into31. ---It seems that my friends don’t understand me. --- Don’t worry. I’m sure you will _________ them if you are really friendly to them. A. agree with B. catch up with C. get on well with D. be fed up with32. Susan’s parents bought a very large house with a nice garden, it______ very expensive. A. must be B. can be C. will be D. may be33. The monkey put on the hat like the old man and ______ here and there in the tree. A. jump B. jumped C. jumping D. jumps34. ---Do you know the result of the relay race ---No, I _________ with others when Mr Gao told us the result.A. was talking B. talked C. will talk D. am talking35. ---What should we do if we are waiting for a bus --- We should _________. A. jump the queue B. wait in line C. push others D. stop the passengers36. ---__________________________ --- Thank you, I’m full now. A. Would you like anything else B. Would you have a picnic with us tomorrow C. Could you buy some fruit for me D. Could you bring me more bread37. The rice tastes _______, we’d better not eat it.A. nice B. delicious C. badly D. terrible38. _____ you don’t leave soon, you’ll be late for school. A. After B. Before C. Until D. If39. --- It’s too bright in the room, would you please ______ some of the lights --- Sure. A. turn on B. turn up C. turn off D. turn into40. ---The runner dropped his stick on the last lap. --- __________ A. That’s OK. B. Bad luck! C. I don’t mind. D. Wonderful.VII. 完形填空：先通读下面短文，掌握其大意，然后从各小题所给四个选项中，选出一个最佳答案。（15分）How much do you know about manners（礼仪） Different countries have (41) manners. In (42) Asian countries, it is good manners to take off your (43) before you go into a house. (44) in European (欧洲)countries, even if they sometimes become very dirty, this is not done. If you are a (45) in a Chinese house, when you have a meal, you usually do not (46) the food. You often leave a little to (47) that you have had enough. But in England, a visitor always finishes food to show that he has (48) it. We must know the customs (风俗) of other (49)，so that they will not think (50)bad-mannered. People all over the world (51) that a well-mannered person should be kind and (52) to others. If you (53) this, at least you will not go very far wrong. (54) likes a person with good manners, but no one likes a person with bad manners. (55) your manners. 41. A. same B. different C. some D. interesting 42. A. some B. any C. other D. few 43. A. bags B. shoes C. coats D. hats 44. A. And B. So C. But D. Or 45. A. stranger B. traveller C. visitor D. foreigner 46. A. need B. finish C. choose D. have 47. A. say B. see C. understand D. show 48. A. finished B. enjoyed C. taken D. drunk 49. A. countries B. villages C. cities D. places 50. A. them B. me C. us D. him 51. A. find B. know C. guess D. agree 52. A. careful B. helpful C. hardworking D. healthy 53. A. forget B. remember C. learn D. study 54. A. Somebody B. Anybody C. Nobody D. Everybody 55. A. Take B. Make C. Mind D. KeepVIII.阅读理解：读A、B篇，选择符合短文内容的正确答案；读C篇，根据短文内容完成句子；读D篇，根据短文内容用英语回答问题。（40分） AA taxi hit a truck. A policeman spoke to the taxi driver and to the truck driver. He also spoke to Tom. He was a witness (目击者). This is what they said.TRUCK DRIVER: I was driving from the airport to Newton. A car crossed the road, so I slowed down. I did not stop. A taxi hit the back of my truck. Nobody was seriously hurt but both cars were damaged（受损害）.TAXI DRIVER: I was driving behind a truck a few kilometers from Newton. The truck stopped suddenly. The driver did not give me a warning (警告). I was driving very slowly. I could not pass the truck because there were two cars coming near from Newton. My taxi hit the truck, and some glass cut my left hand.TOM: I was watching the traffic about a kilometer from the airport. A truck was going to Newton. It was not going very quickly. There was a taxi about two hundred meters behind the truck. It was going fast. When the truck slowed down, the taxi hit it. The taxi driver was not looking at the truck. He was looking out of the window at something. My friend saw the accident, too. Tom's friend spoke to the policeman and agreed with Tom.56. How many people are mentioned (提到) in the story A. Three. B. Four. C. Five. D. Six.57 .The truck was hit on the way ___________ . A. to the airport B. to the police station C. to Newton D. home58. From the story, we know _________didn’t tell the truth. A. the truck driver B. Tom C. the taxi driver D. Tom's friend59. In fact, Tom's friend was also a _____________ . A. witness B. driver C. policeman D. cleaner60. What's the best title (题目) for this passage A. A Taxi Driver B. A Traffic AccidentC. A Story of Tom D. A Truck Driver BPeter wondered why he didn’t have many friends. The reason was he was always taking, never giving. One day Peter told Bill, “I’d like to give a party on Saturday, I’d like you to come and bring Martha, too.” “Thanks, Peter. We’d be happy to come.” “Perhaps you’d like to bring your violin. You and Martha sing well together. I’m sure everyone will want you to sing for us.” That was how Peter began to plan his party. Next he asked another friend, Betty, to bring a cake. “You make the best cake in the world, Betty, and I like to eat your cake better than have one from the bakery.” Peter invited a few other friends to come to his party. He didn’t forget to ask something from each one of them. He even asked Jim and Mary Jackson to let him give the party at their house! They agreed. The party was a big success. However, as the guests were leaving, they said “Thank you ” to Bill and Martha for the music, Betty for the cake, the Jacksons for the use of the house and to others for their hard work. To Peter they just said, “ Thanks for the invitation.”61. The party was held ________ .A. at Peter’s house B. in a large hall C. at Peter’s friend’s house D. in a secret place62. Which of the following is not trueA. Betty made the best cake. B. Mary Jackson sang well.C. Bill played the violin well. D. The Jacksons did hard work for the party.63. ________ liked Peter. A. Many of his friends B. Few people C. Everyone D. All his friends64. Peter ________ to give the party.A. tried his best B. did nothing C. only invited some friends D. did everything65. From the story, we can see Peter was ________ .A. a warm-hearted man B. good at making friendsC. a selfish man D. a welcomed friend CDear editor, I am not a good-looking boy and I am not good at studying, either. Some people don’t even want to talk to me. So I usually feel lonely. Sometimes I think that if I want to leave home, nobody will care. How can I stop feeling like this PeterDear Peter,But first, I am sure that you are wrong that nobody will care if you leave your home. What about your parents And other family members It seems that you are very sad. You'd better go to see a doctor or talk to your parents. They can help you. Second, I'm sure there's someone in your class who feels lonely, too. You never know how other people feel inside. Try to make friends with them. Or you join a club to meet new people and to keep yourself busy. You need to find happiness in yourself. Write a list of all the good things about yourself. Learn to like yourself, and then others will see your confidence (信心) and like you, too. Editor66. Peter isn’t good at _______ and he feels __________.67. He writes to the editor to ask for _______ because he wants to _______feeling lonely.68. If Peter joins a club, he can_______ new people and keep _______ busy.69. The editor suggests (建议) that Tom should talk to a ________ and his ________.70. Peter is lack of (缺少) _______ and he needs to find ________ in himself. DJ.K Rowling was born in England in 1965. She loved reading, and wrote her first story “Rabbit” when she was only six years old. She studied French at university, then worked as a secretary (秘书) in London. She had the idea for Harry Potter (哈里. 波特) when she was on a train, “Harry just walked into my head”, she said later. She started writing the first Harry Potter book the next day. In 1992 she went to live in Portugal for three years. She wrote Harry Potter in the morning, and worked as an English teacher in the afternoon and evening. She got married to a Portuguese TV journalist and had a daughter called Jessica. Then she returned to Edinburgh, in Scotland. She had no job at that time, she wrote in cafes (咖啡馆)because they were warmer than her small house. After five years she finished the first book “Harry Potter and the Philosopher’s stone”. The book sold millions of copies all over the world and J. K. Rowling became very famous. She is very rich now, but she still writes her books in cafes.71. Who is J.K Rowling72. When did she write her first story73. How did she get the idea of Harry Potter74. Why did she write in cafes75. Do you like the story of Harry Potter WhyIX. 完成对话。 选择适当的词或词组完成对话，每个词或词组只能用一次，其中有4个词或词组是多余的。（共10小题，计10分） well certainly looking stayed something visiting never health reading by the way happy nothing tired sorryC：Hello, Mike. You don’t look ____76_____. What’s the matterM: Oh. There is ____77_____ serious, I just have a headache, I bang my head.C: What did you do last nightM: I ____78____ online（网上）.C: Maybe you were online too long. You’d better have a rest. M: Thanks. Have you ever been onlineC: No, ___79_____. Are you often onlineM: Yes, I often search the Internet at weekends.C: What do you often do onlineM: ___80____ some website (网站), sending e-mails, ___81_____ news, seeing films, playing games and so on..C: It must be very cool. Could you teach me how to search the InternetM: ___82____. But I really feel ___83____ now. I will teach you some day and you can do it by yourself.C: Thanks a lot.___84_____, don’t be online too long. It may be bad for your ____85____.X.写作：请根据下列提示写一篇短文。（15分）要求：1，条理清楚，意思连贯，语句通顺，书写规范；2，要将所提示的内容全部体现在文中；3，不少于50词。提示：1. Which person do you like best 2. When and where was he or she born 3. Why do you like him or her best 4. Can you tell a short story about him or her宜昌市2005年八年级下学期英语期末调研考试听力录音稿及答案I．情景反应：你将听到5个问题，每个问题你将看到供选择的三个答案。请根据你所听到的问句选择适当的答语。听一遍。1. I’m going to Beijing next week, you know it’s one of the most beautiful cities in China.2. Our class won the girls’ relay race in our school’s sports meeting.3. Jim, please don’t put your head out of the window on the bus. It’s dangerous!4. When did you move to America5. Don’t forget to come to my party this evening!II．图片理解。 你将听到一段小故事，请按故事情节给下面的图片排序。听一遍。It was Monday. Cathy got up early. After breakfast, she hurried to school by bike. At school, she listened to the teachers carefully and studied hard. She had lunch with her best friend, Kate, at school. In the afternoon, she played tennis for an hour. She got home at 5 o’clock. After a short rest she started to do some cooking for her parents. What a nice girl she is!III．单句理解：请选择与你所听到的句子意思相近的选项。听两遍。11. Look! How fast Li Lei and Jim are running! They are almost neck and neck!12. He began to do his homework at 7 and finished it at 9 o’ clock.13. Dick hopes to be an engineer like his brother in the future.14. It’s too dangerous to swim in the deep river.15. He couldn’t afford the ticket, so he didn’t go to the concert.IV．对话理解：你将听到两段对话，每段对话后有几个问题。请根据你所听到的对话内容选择适当的答语。听两遍。听第一段对话，回答16，17小题。1.W: Come on, Jack. The picnic is ready.M: I’m coming. Oh, there are so many things to eat and drink.W: Would you like something to drinkM: Coke, please. Coke is my favourite.W: Here you are. Would you like a chicken sandwichM: No, thanks. I’d better not. I’d like a tomato sandwich.听第二段对话，回答18，19，20小题。2.W: Good morning, doctor.M: Good morning, Mrs Brown. Well, what’s wrong with this young manW: He’s my son Jim. He’s a headache. M: Did you take his temperatureW: Yes, his temperature seems to be OK.M: Did he have anything to eat for breakfast this morningW: Yes. He had only a little porridge.M: Well, Mrs Brown. I think he has a cold.W: Shall I keep him out of schoolM: No, it will be all right for him to go to school.W: OK, thank you. Doctor.Ⅴ.短文理解：你将听到一段短文，请根据听到的内容选择正确的答案回答问题，听两遍It was very cold last Sunday. Paul and his friends Allan, Bill and Betty went to the lake after breakfast. They began to skate on the ice. Paul skated better than his three friends. He skated fast and didn’t know a piece of ice was broken. He fell into the water. His friends were afraid and called for help. Just then two workers walked there and heard them. They ran there quickly and helped the boy come out of the water. Then they took him to a hospital. Paul and his parents thanked them very much.答案1-5：ACBAB 6-10：DBECA 11-15：BCCAA 16-20：CBBBC21-25：ABBCC 26-30：BDCBA 31-35：CABAB 36-40：ADDCB41-45：BABCC 46-50：BDBAC 51-55：DBBDD 56-60：CCCAB61-65：CBBCC 66. studying, lonely 67. help, stop 68. meet, himself69. doctor, parents 70. confidence, happiness71. She is the writer of the book “ Harry Potter”.72. When she was 6 years old.73. She had the idea when she was on a train.74. Because they were warmer than her small house.75. Yes. Because it’s interesting.76. well 77. nothing 78. stayed 79. never 80. Visiting 81. reading82. certainly 83. tired 84. by the way 85. health书面表达略。
名校调研系列卷八年级下第一次月考语文长春版试卷答案
习题虽然都有答案，但是都是在自己完全答完题之后对的，在网上是问不到答案的哈
不是对着答案抄袭的，那样效果不是很好，多看书
鸿儒经典 单元达标重点名校调研卷 八年级华师大版语文(下)
2014年八年级下册语文单元达标
重点名校八年级下期调研试卷（二）参考答案
八年级下册数学测试卷及答案解析
很多学生到了 八年级 数学成绩开始下降,其实很大一部分原因是没有掌握好课本的基础知识。下面是我整理的八年级下册数学测试卷及答案解析，欢迎阅读分享，希望对大家有所帮助。
八年级下册数学测试卷及答案
一、选择题：
1.下列各式从左到右，是因式分解的是()
A.(y﹣1)(y+1)=y2﹣1B.x2y+xy2﹣1=xy(x+y)﹣1
C.(x﹣2)(x﹣3)=(3﹣x)(2﹣x)D.x2﹣4x+4=(x﹣2)2
【考点】因式分解的意义.
【分析】根据因式分解就是把一个多项式变形成几个整式的积的形式的定义，利用排除法求解.
【解答】解：A、是多项式乘法，不是因式分解，故本选项错误;
B、结果不是积的形式，故本选项错误;
C、不是对多项式变形，故本选项错误;
D、运用完全平方公式分解x2﹣4x+4=(x﹣2)2，正确.
故选D.
【点评】这类问题的关键在于能否正确应用分解因式的定义来判断.
2.下列四个图形中，既是轴对称图形又是中心对称图形的是()
A.B.C.D.
【考点】中心对称图形;轴对称图形.
【分析】根据轴对称图形与中心对称图形的概念求解.
【解答】解：A、不是轴对称图形，是中心对称图形;
B、是轴对称图形，也是中心对称图形;
C、是轴对称图形，不是中心对称图形;
D、是轴对称图形，不是中心对称图形.
故选B.
【点评】本题考查了中心对称图形与轴对称图形的概念.轴对称图形的关键是寻找对称轴，图形两部分折叠后可重合;中心对称图形是要寻找对称中心，旋转180度后两部分重合.
3.下列多项式中不能用平方差公式分解的是()
A.a2﹣b2B.﹣x2﹣y2C.49x2﹣y2z2D.16m4n2﹣25p2
【考点】因式分解﹣运用公式法.
【分析】能用平方差公式分解的式子的特点是：两项都是平方项，符号相反.
【解答】解：A、符合平方差公式的特点;
B、两平方项的符号相同，不符和平方差公式结构特点;
C、符合平方差公式的特点;
D、符合平方差公式的特点.
故选B.
【点评】本题考查能用平方差公式分解的式子的特点，两平方项的符号相反是运用平方差公式的前提.
4.函数y=kx+b(k、b为常数，k≠0)的图象如图，则关于x的不等式kx+b0的解集为()
A.x0B.x0C.x2D.x2
【考点】一次函数与一元一次不等式.
【分析】从图象上得到函数的增减性及与x轴的交点的横坐标，即能求得不等式kx+b0的解集.
【解答】解：函数y=kx+b的图象经过点(2，0)，并且函数值y随x的增大而减小，
所以当x2时，函数值小于0，即关于x的不等式kx+b0的解集是x2.
故选C.
【点评】本题考查了一次函数与不等式(组)的关系及数形结合思想的应用，注意几个关键点(交点、原点等)，做到数形结合.
5.使分式有意义的x的值为()
A.x≠1B.x≠2C.x≠1且x≠2D.x≠1或x≠2
【考点】分式有意义的条件.
【分析】根据分式有意义，分母不等于0列不等式求解即可.
【解答】解：由题意得，(x﹣1)(x﹣2)≠0，
解得x≠1且x≠2.
故选C.
【点评】本题考查了分式有意义的条件，从以下三个方面透彻理解分式的概念：(1)分式无意义?分母为零;(2)分式有意义?分母不为零;(3)分式值为零?分子为零且分母不为零.
6.下列是最简分式的是()
A.B.C.D.
【考点】最简分式.
【分析】先将选项中能化简的式子进行化简，不能化简的即为最简分式，本题得以解决.
【解答】解：，无法化简，，，
故选B.
【点评】本题考查最简分式，解题的关键是明确最简分式的定义.
7.如图所示的正方形网格中，网格线的交点称为格点.已知A、B是两格点，如果C也是图中的格点，且使得△ABC为等腰三角形，则点C的个数是()
A.6B.7C.8D.9
【考点】等腰三角形的判定.
【专题】分类讨论.
【分析】根据题意，结合图形，分两种情况讨论：①AB为等腰△ABC底边;②AB为等腰△ABC其中的一条腰.
【解答】解：如上图：分情况讨论.
①AB为等腰△ABC底边时，符合条件的C点有4个;
②AB为等腰△ABC其中的一条腰时，符合条件的C点有4个.
故选：C.
【点评】本题考查了等腰三角形的判定;解答本题关键是根据题意，画出符合实际条件的图形，再利用数学知识来求解.数形结合的思想是数学解题中很重要的解题思想.
8.若不等式组的解集是x2，则a的取值范围是()
A.a2B.a≤2C.a≥2D.无法确定
【考点】解一元一次不等式组.
【专题】计算题.
【分析】解出不等式组的解集，与已知解集x2比较，可以求出a的取值范围.
【解答】解：由(1)得：x2
由(2)得：xa p=""
因为不等式组的解集是x2
∴a≥2
故选：C.
【点评】本题是已知不等式组的解集，求不等式中另一未知数的问题.可以先将另一未知数当作已知处理，求出解集与已知解集比较，进而求得零一个未知数.
9.下列式子：(1);(2);(3);(4)，其中正确的有()
A.1个B.2个C.3个D.4个
【考点】分式的基本性质.
【分析】根据分式的基本性质作答.
【解答】解：(1)，错误;
(2)，正确;
(3)∵b与a的大小关系不确定，∴的值不确定，错误;
(4)，正确.
故选B.
【点评】在分式中，无论进行何种运算，如果要不改变分式的值，则所做变化必须遵循分式基本性质的要求.
10.某煤矿原计划x天生存120t煤，由于采用新的技术，每天增加生存3t，因此提前2天完成，列出的方程为()
A.==﹣3B.﹣3
C.﹣3D.=﹣3
【考点】由实际问题抽象出分式方程.
【分析】设原计划x天生存120t煤，则实际(x﹣2)天生存120t煤，等量关系为：原计划工作效率=实际工作效率﹣3，依此可列出方程.
【解答】解：设原计划x天生存120t煤，则实际(x﹣2)天生存120t煤，
根据题意得，=﹣3.
故选D.
【点评】本题考查由实际问题抽象出分式方程，关键设出天数，以工作效率作为等量关系列方程.
二、填空题：
11.分解因式x2(x﹣y)+(y﹣x)=(x﹣y)(x+1)(x﹣1).
【考点】提公因式法与公式法的综合运用.
【分析】把(x﹣y)看作一个整体并提取，然后再利用平方差公式继续分解因式即可.
【解答】解：x2(x﹣y)+(y﹣x)
=x2(x﹣y)﹣(x﹣y)
=(x﹣y)(x2﹣1)
=(x﹣y)(x+1)(x﹣1).
故答案为：(x﹣y)(x+1)(x﹣1).
【点评】本题考查了用提公因式法和公式法进行因式分解，一个多项式有公因式首先提取公因式，然后再用其他 方法 进行因式分解，同时因式分解要彻底，直到不能分解为止.
12.当x=﹣2时，分式无意义.若分式的值为0，则a=﹣2.
【考点】分式的值为零的条件;分式有意义的条件.
【分析】根据分母为零，分式无意义;分母不为零，分式有意义，分子为零分母不为零分式的值为零，可得答案.
【解答】解：∵分式无意义，
∴x+2=0，
解得x=﹣2.
∵分式的值为0，
∴，
解得a=﹣2.
故答案为：=﹣2，﹣2.
【点评】本题考查了分式有意义的条件，从以下三个方面透彻理解分式的概念：分式无意义?分母为零;分式有意义?分母不为零;分式值为零?分子为零且分母不为零.
13.如图，在△ABC中，BC边上的垂直平分线DE交边BC于点D，交边AB于点E.若△EDC的周长为24，△ABC与四边形AEDC的周长之差为12，则线段DE的长为6.
【考点】线段垂直平分线的性质.
【专题】计算题;压轴题.
【分析】运用线段垂直平分线定理可得BE=CE，再根据已知条件“△EDC的周长为24，△ABC与四边形AEDC的周长之差为12”表示出线段之间的数量关系，联立关系式后求解.
【解答】解：∵DE是BC边上的垂直平分线，
∴BE=CE.
∵△EDC的周长为24，
∴ED+DC+EC=24，①
∵△ABC与四边形AEDC的周长之差为12，
∴(AB+AC+BC)﹣(AE+ED+DC+AC)=(AB+AC+BC)﹣(AE+DC+AC)﹣DE=12，
∴BE+BD﹣DE=12，②
∵BE=CE，BD=DC，
∴①﹣②得，DE=6.
故答案为：6.
【点评】此题主要考查线段的垂直平分线的性质等几何知识.线段的垂直平分线上的点到线段的两个端点的距离相等.
14.若4a4﹣ka2b+25b2是一个完全平方式，则k=±20.
【考点】完全平方式.
【分析】根据4a4﹣ka2b+25b2是一个完全平方式，利用此式首末两项是2a2和5b这两个数的平方，那么中间一项为加上或减去2a2和5b积的2倍，进而求出k的值即可.
【解答】解：∵4a4﹣ka2b+25b2是一个完全平方式，
∴4a4﹣ka2b+25b2=(2a2±5b)2，
=4a4±20a2b+25b2.
∴k=±20，
故答案为：±20.
【点评】此题主要考查的是完全平方公式的应用;两数的平方和，再加上或减去它们积的2倍，就构成了一个完全平方式.注意积的2倍的符号，避免漏解.
15.如图，在△ABC中，∠C=90°，AC=BC，斜边AB=2，O是AB的中点，以O为圆心，线段OC的长为半径画圆心角为90°的扇形OEF，弧EF经过点C，则图中阴影部分的面积为﹣.
【考点】扇形面积的计算.
【分析】连接OC，作OM⊥BC，ON⊥AC，证明△OMG≌△ONH，则S四边形OGCH=S四边形OMCN，求得扇形FOE的面积，则阴影部分的面积即可求得.
【解答】解：连接OC，作OM⊥BC，ON⊥AC.
∵CA=CB，∠ACB=90°，点O为AB的中点，
∴OC=AB=1，四边形OMCN是正方形，OM=.
则扇形FOE的面积是：=.
∵OA=OB，∠AOB=90°，点D为AB的中点，
∴OC平分∠BCA，
又∵OM⊥BC，ON⊥AC，
∴OM=ON，
∵∠GOH=∠MON=90°，
∴∠GOM=∠HON，
则在△OMG和△ONH中，
，
∴△OMG≌△ONH(AAS)，
∴S四边形OGCH=S四边形OMCN=()2=.
则阴影部分的面积是：﹣.
故答案为：﹣.
【点评】本题考查了三角形的全等的判定与扇形的面积的计算的综合题，正确证明△OMG≌△ONH，得到S四边形OGCH=S四边形OMCN是解题的关键.
三、解答题
16.(21分)(2016春?成都校级期中)(1)因式分解：2x2y﹣4xy2+2y3;
(2)解方程：=+;
(3)先化简，再求值(﹣x+1)÷，其中;
(4)解不等式组，把解集在数轴上表示出来，且求出其整数解.
【考点】分式的化简求值;提公因式法与公式法的综合运用;解分式方程;在数轴上表示不等式的解集;解一元一次不等式组;一元一次不等式组的整数解.
【分析】(1)先提公因式，然后根据完全平方公式解答;
(2)去分母后将原方程转化为整式方程解答.
(3)将括号内统分，然后进行因式分解，化简即可;
(4)分别求出不等式的解集，找到公共部分，在数轴上表示即可.
【解答】解：(1)原式=2y(x2﹣2xy+y2)
=2y(x﹣y)2;
(2)去分母，得(x﹣2)2=(x+2)2+16
去括号，得x2﹣4x+4=x2+4x+4+16
移项合并同类项，得﹣8x=16
系数化为1，得x=﹣2，
当x=﹣2时，x+2=0，则x=﹣2是方程的增根.
故方程无解;
(3)原式=[﹣]?
=?
=?
=﹣，
当时，原式=﹣=﹣=﹣;
(4)
由①得x2，
由②得x≥﹣1，
不等式组的解集为﹣1≤x2，
在数轴上表示为
.
【点评】本题考查的是分式的化简求值、因式分解、解一元一次不等式组、在数轴上表示不等式组的解集，考查内容较多，要细心解答.
17.在如图所示的直角坐标系中，每个小方格都是边长为1的正方形，△ABC的顶点均在格点上，点A的坐标是(﹣3，﹣1).
(1)将△ABC沿y轴正方向平移3个单位得到△A1B1C1，画出△A1B1C1，并写出点B1坐标;
(2)画出△A1B1C1以点O为旋转中心、顺时针方向旋转90度的△A2B2C2，并求出点C1经过的路径的长度.
【考点】作图﹣旋转变换;作图﹣平移变换.
【分析】(1)分别作出点A、B、C沿y轴正方向平移3个单位得到对应点，顺次连接即可得;
(2)分别作出点A、B、C以点O为旋转中心、顺时针方向旋转90度得到对应点，顺次连接即可得，再根据弧长公式计算即可.
【解答】解：(1)如图，△A1B1C1即为所求作三角形，点B1坐标为(﹣2，﹣1);
(2)如图，△A2B2C2即为所求作三角形，
∵OC==，
∴==π.
【点评】本题考查了平移作图、旋转作图，解答本题的关键是熟练平移的性质和旋转的性质及弧长公式.
18.小明和同学一起去书店买书，他们先用15元买了一种科普书，又用15元买了一种文学书，科普书的价格比文学书的价格高出一半，因此他们买的文学书比科普书多一本，这种科普和文学书的价格各是多少?
【考点】分式方程的应用.
【专题】应用题.
【分析】根据题意，设科普和文学书的价格分别为x和y元，则根据“科普书的价格比文学书的价格高出一半，买的文学书比科普书多一本“列方程组即可求解.
【解答】解：设科普和文学书的价格分别为x和y元，
则有：，
解得：x=7.5，y=5，
即这种科普和文学书的价格各是7.5元和5元.
【点评】本题考查分式方程的应用，同时考查学生理解题意的能力，关键是根据“科普书的价格比文学书的价格高出一半，买的文学书比科普书多一本“列出方程组.
19.已知关于x的方程=3的解是正数，求m的取值范围.
【考点】解分式方程;解一元一次不等式.
【专题】计算题.
【分析】先解关于x的分式方程，求得x的值，然后再依据“解是正数”建立不等式求m的取值范围.
【解答】解：原方程整理得：2x+m=3x﹣6，
解得：x=m+6.
因为x0，所以m+60，即m﹣6.①
又因为原式是分式方程，所以x≠2，即m+6≠2，所以m≠﹣4.②
由①②可得，m的取值范围为m﹣6且m≠﹣4.
【点评】本题主要考查了分式方程的解法及其增根产生的原因.解答本题时，易漏掉m≠4，这是因为忽略了x﹣2≠0这个隐含的条件而造成的，这应引起同学们的足够重视.
20.(12分)(2016?河南模拟)问题：如图(1)，点E、F分别在正方形ABCD的边BC、CD上，∠EAF=45°，试判断BE、EF、FD之间的数量关系.
【发现证明】小聪把△ABE绕点A逆时针旋转90°至△ADG，从而发现EF=BE+FD，请你利用图(1)证明上述结论.
【类比引申】如图(2)，四边形ABCD中，∠BAD≠90°，AB=AD，∠B+∠D=180°，点E、F分别在边BC、CD上，则当∠EAF与∠BAD满足∠BAD=2∠EAF关系时，仍有EF=BE+FD.
【探究应用】如图(3)，在某公园的同一水平面上，四条通道围成四边形ABCD.已知AB=AD=80米，∠B=60°，∠ADC=120°，∠BAD=150°，道路BC、CD上分别有景点E、F，且AE⊥AD，DF=40(﹣1)米，现要在E、F之间修一条笔直道路，求这条道路EF的长(结果取整数，参考数据：=1.41，=1.73)
【考点】四边形综合题.
【分析】【发现证明】根据旋转的性质可以得到△ADG≌△ABE，则GF=BE+DF，只要再证明△AFG≌△AFE即可.
【类比引申】延长CB至M，使BM=DF，连接AM，证△ADF≌△ABM，证△FAE≌△MAE，即可得出答案;
【探究应用】利用等边三角形的判定与性质得到△ABE是等边三角形，则BE=AB=80米.把△ABE绕点A逆时针旋转150°至△ADG，只要再证明∠BAD=2∠EAF即可得出EF=BE+FD.
【解答】【发现证明】证明：如图(1)，∵△ADG≌△ABE，
∴AG=AE，∠DAG=∠BAE，DG=BE，
又∵∠EAF=45°，即∠DAF+∠BEA=∠EAF=45°，
∴∠GAF=∠FAE，
在△GAF和△FAE中，
，
∴△AFG≌△AFE(SAS)，
∴GF=EF，
又∵DG=BE，
∴GF=BE+DF，
∴BE+DF=EF;
【类比引申】∠BAD=2∠EAF.
理由如下：如图(2)，延长CB至M，使BM=DF，连接AM，
∵∠ABC+∠D=180°，∠ABC+∠ABM=180°，
∴∠D=∠ABM，
在△ABM和△ADF中，
，
∴△ABM≌△ADF(SAS)，
∴AF=AM，∠DAF=∠BAM，
∵∠BAD=2∠EAF，
∴∠DAF+∠BAE=∠EAF，
∴∠EAB+∠BAM=∠EAM=∠EAF，
在△FAE和△MAE中，
，
∴△FAE≌△MAE(SAS)，
∴EF=EM=BE+BM=BE+DF，
即EF=BE+DF.
故答案是：∠BAD=2∠EAF.
【探究应用】如图3，把△ABE绕点A逆时针旋转150°至△ADG，连接AF，过A作AH⊥GD，垂足为H.
∵∠BAD=150°，∠DAE=90°，
∴∠BAE=60°.
又∵∠B=60°，
∴△ABE是等边三角形，
∴BE=AB=80米.
根据旋转的性质得到：∠ADG=∠B=60°，
又∵∠ADF=120°，
∴∠GDF=180°，即点G在CD的延长线上.
易得，△ADG≌△ABE，
∴AG=AE，∠DAG=∠BAE，DG=BE，
又∵AH=80×=40，HF=HD+DF=40+40(﹣1)=40
故∠HAF=45°，
∴∠DAF=∠HAF﹣∠HAD=45°﹣30°=15°
从而∠EAF=∠EAD﹣∠DAF=90°﹣15°=75°
又∵∠BAD=150°=2×75°=2∠EAF
∴根据上述推论有：EF=BE+DF=80+40(﹣1)≈109(米)，即这条道路EF的长约为109米.
【点评】此题主要考查了四边形综合题，关键是正确画出图形，证明∠BAD=2∠EAF.此题是一道综合题，难度较大，题目所给例题的思路，为解决此题做了较好的铺垫.
八年级数学怎么快速提高
一、做好数学 课前预习 工作
很多学生在数学课前预习的习惯，这样会造成课上学的不太懂、课后翻书找不到的这样的情况。要有针对性的 数学 学习方法 。根据自己的情况 总结 不足，有针对性的调整学习方法。总之，只要有了认真的 学习态度 ，有了学习的决心，再加上正确务实的数学学习方法，快速提高数学成绩不是问题。
二、学会记笔记
记笔记可能很多家长觉得不难，而且学生是有记笔记的，那么为什么数学成绩还是不好呢?要注重思考和归纳总结。老师讲过的题目不能仅仅是听懂，还要会;另外对于上课没听懂的数学题一定要记在数学笔记上。
1、课前预习不会的要记在数学笔记上，课上可以与老师交流;
2、上课时，记下老师讲的重点，也可把模糊的数学知识点记住。
3、课后笔记则是对课上不理解的知识点进行整理，并且先根据自己的笔记去尝试是否能解开不懂的地方，若不能则需要及时的询问老师，养成不懂就问的好习惯。
三、能找出错误的数学点
学生们在提高数学成绩时，会找出学生作业或考试中的错误点，让自己能清楚知道自己哪里做错了，并且能够改正自己的错误。
初二数学学习技巧
技巧1：要熟记数学题型
初二数学大大小小有几十个知识点，每个知识点都有对应的题目。相关的题目无非就是这个知识点的灵活运用，掌握了题型就可以做到举一反三。与其做十道题，还不如熟练掌握一道题，如果你对数学不那么感兴趣，背题可以使你免受练习之苦，还能更有效率的增强考试成绩。只要记下足够的题型，就可以使你的分数上一个层次。
技巧2：注重课本知识要点
要吃透课本，课本上重要的定义，以及想数学公式的由来和演变、知识点的应用。这是较起码的要求，为下一步做题“回归课本”打好基础。基础差先记数学的知识点。手边常备一本小手册，用零碎时间看一看，只有大脑记住那个知识点，遇到有关这个知识点的题才能解决。所以基础差的同学还是要下点功夫。只要坚持，有耐心，努力的话，两个月时间之内数学成绩会有大幅度增强的。
技巧3：对错题进行纠错整理
如果你的数学成绩不是太差，也就是说考试能及格的可以把注意力放在背题上，但遇到想不出来的知识点，还是要巩固一下。对于经常出错的题目，可以整理成一个纠错本，对错误的点，错误原因标注清楚。同时提醒自己以后遇到这种类型的题目应该注意什么细节，进步其实就是减小自己犯错的概率，把该拿的分数要拿下来。
初二数学注意事项
1、按部就班。初二数学是环环相扣的一门学科，哪一个环节脱节都会影响整个学习的进程。所以，平时学习不应贪快，要一章一章过关，不要轻易留下自己不明白或者理解不深刻的问题。
2、强调理解。概念、定理、公式要在理解的基础上记忆。我的 经验 是，每新学一个定理，便尝试先不看答案，做一次例题，看是否能正确运用新定理;若不行，则对照答案，加深对定理的理解。
3、基本训练。学习初二数学是不能缺少训练的，平时多做一些难度适中的练习，当然莫要陷入死钻难题的误区，要熟悉常考的题型，训练要做到有的放矢。
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2011名校调研系列卷八下第三次语文老费的小屋 阅读答案~
上次和公司同事去好像是两百多，大床房，两个人睡绰绰有余。不过看时价的吧，房紧的时候会贵一点。
名校调研系列卷每周一考八年级下物理答案
一、填空题
1、地球、天舟一号
2、拉，二力平衡;摩擦
3、支持力、摩擦力
4、1X 105；0
5、4；竖直向上
6、增大，减小
7、（1）弹性势能和重力势能；（2）动能和重力势能
8、p==pz=p丙
9、 压强更小
二、单项选择题
10-15：BBDAAB
16-20： CCAAD
三、作图题
21、
四、实验题
22
（1）5
（2）7，在7N的拉力范围内，弹簧发生弹性形变。
（3） 5.5,
23、乒乓球不受浮力，只受水的压力；乓球受到浮力的作用，浮力大于乒乓球的重力
24、1 ; 1；排开的水所受的重力。
五、计算题
扩展资料
这一部分主要考察的知识点是浮力与压强：
物体在液体中下表面受到的压力大于物体在液体中上表面受到的压力，所以合力为F向上-F向下，原因是液体内部向各个方向都有压强，那么物体上表面受到液体给它的一个向下的压力，而物体下表面受到液体给它的一个向上的压力。由于在同种液体中，深度越大，压强越大。
产生浮力的原因，可用浸没在液体内的正立方体的物体来分析。该物体系全浸之物体，受到四面八方液体的压力，而且是随深度的增加而增大的。所以这个正立方体的前后、左右、上下六个面都受到液体的压力。
因为作用在左右两个侧面上的力由于两侧面相对应，而且面积大小相等，又处于液体中相同的深度，所以两侧面上受到的压力大小相等，方向相反，两力彼此平衡。
同理，作用在前后两个侧面上的压力也彼此平衡。但是上下两个面因为在液体中的深度不相同，所以受到的压强也不相等。上面的压强小，下面受到的压强大，下面受到向上的压力大于上面受到的向下的压力。液体对物体这个压力差，就是液体对物体的浮力。这个力等于被物体所排开的液体的重力。
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