人教版七上第9周周末练习
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初一英语Unit 9周清试卷2016.11一.单选(2*20=40分)答案:1-5__________6-10_________11-15_________16-20___________ 1. —When do you ______?—______ Monday,Wednesday and Friday.A.have math;On B.have a math;At C.have math;At D.have a math;On 2.Nick is ten years old.______ favorite food is chicken. A.My B.His C.Our D.Your3. ---_____? ---It’s Wednesday.A. What day is it todayB. What’s the timeC. What’s the date todayD. Is it Wednesday4. —Why don't you like English? —Because it's ______.A.interesting B.fun C.exciting D.difficult5. We often play _____ basketball after ______ class. A. the, / B. /, / C. a, the D. the, a6. It is _____eight o’clock now. I must go to school. A.at B.\ C.to D. for7. —What do you eat for breakfast ? —___.A. At 6:30 B. Usually C. Bread and eggs D. At home8. After class, I have gymnastics .A. At two hoursB. for two hoursC. for a hourD. at an hour9. —Is Steve’s favorite day Friday? —.A. No, it isB. Yes, he isC. Yes, it isD. No, he isn’t10. Ken and Linda’s favorite subject P.E.A. are B. is C. am D. aren’t11.--What is the date today? --- .A. It’s June 2ndB. It’s the May 5th,2008C. It’s April 3rd, SundayD. It’s Tuesday12. --Why Tuesday David’s favorite day? -- Because he P.E.A. does, hasB. is, hasC. does, haveD. is , have13. We have math ________ Friday. It’s difficult ________ interesting.A.on, and B.on, but C.in, or D.in, and14. I have P.E.____ _the afternoon of Tuesday. A.in B.at C. on D. for15. Do you have history ________ Monday afternoon. A.in B.at C.on D.for16. He ____ biology. It’s so boring. A. like B. likes C. don’t like D. doesn’t like17. Ken has science ____ this afternoon. A.in B. on C. at D. /18. ---___ do you have music? ---I have music on Tuesday and Wednesday.A. WhatB. HowC. WhereD. When19. Miss Chen teaches___ math. We all like __very much. A. us; her B. our; her ;him D. our; him20. My ____favorite subject is P.E. A. brother B. brother’s C. of brother D. of brother’s二. 完形填空(1*10=10分) 答案:1-5__________ 6-10_________Meimei is a middle school student. She likes English very much. And she 1 it. She often tells her parents 2 her English study. Now she is 3 her mother about her English study again. Meimei says, “Look, Mum, this is our new English book. There 4 a lot of interesting stories in it. ”“Mm, not bad. Do you only 5 in class, or does your teacher explain(解释)everything to you in Chinese? ”“Oh, no. We speak English for most of the time in class. Our teacher 6 to us only in English. Sometimes 7 not easy for us to understand her, but she says that listening and speaking help us very much. ”“I think she is right. Does she speak English very slowly? ”“Not always. Sometimes we 8 . Then she says is again.”“Is it interesting to study English? ”“Yes, 9 . And I’m going to work harder at it in the new school year. I’m going to do my best(尽最大努力).”“That’s good. I’m 10 you’ll study better.”1. A.good at B.is good at C.well in D.is well in2.A.with B.to C.about D.on3.A.talks with B.talks to C.talking D. talking with4.A.is B. are C .have D. has5.A.say English B.tell English C. talk English D.speak English6.A.speaks B. calls C. tells D. asks7.A.we’re B.they’re C.it’s D.this is8.A.not understand her B.don’t understand her C.not understand him D.don’t understand him9.A.it is B.it do C.it isn’t D.it doesn’t 10.A.think B.know C.sure D.want三.阅读理解(2*10=20分)答案:1-5___________ 6-10__________My name is Cindy. I'm thirteen. I'm a middle school student. I'm in Class Three,Grade Seven. I have some new subjects this year. They are science and history. My favorite day is Thursday because I have science on that day. I have a twin sister.Her name is Sonia. She is also a middle school student. She is in Class Six,Grade Seven. She likes English. Her favorite day is Monday because she has English on that day. My father is Mr. White. He is a math teacher. His favorite day is Sunday because he can go to the baseball club. He likes playing baseball. My mother is Mrs. White. She is a clerk at Huaxing Clothes Store. Her favorite day is Saturday because on that day she doesn't go to work. And she can play tennis with her friends. Oh,my mother likes playing tennis.1.Cindy's favorite subject is ______. A.science B.history C.math D.English 2.Sonia is ______ years old this year. A.seven B.nine C.thirteen D.fourteen3.Mr. White has two ______. A.sons B.sisters C.brothers D.daughters4.On ______,Mr. White usually goes to the baseball club.A.Saturday B.Monday C.Thursday D.Sunday5.Mrs. White works in a ______. A.club B.hotel C.school D.storeMike works very long hours every day. He usually gets up at 17:00. He has a shower and makes his breakfast. What a funny time to make breakfast! After breakfast he practices his guitar, then he puts on his jacket and goes to work. To get to work, he takes the number17 bus to the Star Hotel. The bus usually leaves at 19:15. He works all night. People love to listen to him! He gets home at 7:00, and he watches the early morning news on TV. He goes to bed at 8:30, a tired but happy man. Can you think what his job is?6. How long does Mike work? A. 7 hours B. 8 hours C. about 9 hours D. all night7. He _______ and makes his breakfast. A. gets up B. takes a shower C. works D. washes his face8. What does Mike do after breakfast? A. He goes to work. B. He puts on his clothes.C. He practices his guitar, then puts on his jacket and goes to work.D. He practices his guitar.9. Maybe he is ________. A. a worker B. a singer C. a writer D. a teacher10. How does he go to work? A. By car B. By bikes C. On foot D. By bus四.用下列表格提供的单词适当形式填空。
第九周七年级数学周测一 选择题 (每小题4分,共36分)( ) 1.我市2013年12月21日至24日每天的最高气温与最低气温如下表:其中温差最大的一天是A .12月21日B .12月22日C .12月23日D .12月24日 ( ) 2.下列各对数中,互为相反数的是:A.()2--和2B. )(和3)3(+--+C.221-和 D. ()55----和 ( ) 3 下列式子:0,5,,73,41,222x cabab a x -++中,整式的个数是: A. 6 B. 5 C. 4 D. 3 ( ) 4 一个数的平方和它的倒数相等,则这个数是:A. 1B. -1C. ±1D. ±1和0 ( )5.下列计算正确的是:A. 4812-=--B. 945-=+-C. 1091-=--D. 932=-( )6. 2.如图1所示,A ,B 两点在数轴上,点A 对应的数为2.若线段AB 的长为3,则点B 对应的数为:A .-1B .-2C .-3D .-4( ) 7.若()ba b a 则,032122=-+-=A.61 B. 21- C. 6 D. 81( ) 8.下列说法正确的是:A.0,<-=a a a 则若B. 0,0,0><<b ab a 则若 C 是七次三项式式子124332+-y x xy D. mbm a m b a ==是有理数,则若, ( ) 9. 一个多项式加上,3332322y x x xy y x --得则这个多项式是:A. x 3+3xy 2B. x 3-3xy 2C. x 3-6x 2y+3xy 2D. x 3-6x 2y-3x 2y二 填空(每小题4分,共36分)10.绝对值大于1而小于3的整数的和为______;11.-35的倒数的绝对值是______;12.若a 、b 互为相反数,c 、d 互为倒数,则2a+3cd+2b=______; 13.用科学记数法表示:2014应记为______;14.单项式322yx -的系数是______,次数是______;15.=+--n m xy y x mn 是同类项,则与若213213 ______; 16.如果5x+3与-2x+9是互为相反数,则x 的值是______;17.每件a 元的上衣先提价10%,再打九折以后出售的价格是______元/件; 18. 多项式8-6x y 3y -3kx y -x 22+不含xy 项,则k = ; 三 计算(19-22每小题4分,23-24题每小题6共28分) 19) ()3032324-⨯⎪⎭⎫⎝⎛--÷- 20) ()()13181420----+- 21) ()313248522⨯-÷+-+- 22)mn n m mn mn n m 36245222++-+- 23.先化简,再求值:⎥⎦⎤⎢⎣⎡+⎪⎭⎫ ⎝⎛+--224231325x xy xy x 。
东田庄学校2010-2011学年度第一学期七年级数学第9周周末小卷班级__________ 姓名__________ 完成时间__________1、观察下列各式:①023=-x ②2839-=- ③54-x ④y x =-54⑤1=+y x ⑥43=-xy ⑦1242=-y ⑧062≠-x ⑨42>+x ⑩3=x ;等式有: 方程有: 一元一次方程有: .整式有:____________________.2、在方程432-=+x x 中,已知数是 未知数是 .3、把x=2代入方程3854-=+x x ,左边= 右边= ,因为左边_____ 右边,所以x=2 方程3854-=+x x 的解4、若412-+x x 与互为相反数,则可得方程 估算x=5、x=3是下列哪个方程的解?( )A 062=+xB x x -=104C ()03=-x xD 1272=-x6、已知等式53=-x ,根据等式的性质1,两边同时 ,得.x= .7、已知等式3.15.0=+x ,根据等式的性质1,两边同时 得x= .8、已知等式62-=x ,根据等式的性质2,两边都 得x= .9、已知等式541=x ,根据等式的性质2,两边都 得x= 10、已知等式183=-x , ,两边都加上 得3x= ,再将等式两边___________ 得x= .11、用适当的数或式填空若853=+x ,则-=83x ;若725+-=x x ,则+x 5 =7 ;若234-=x x 则4x+ =-2 ;若5x -1=2x+8,则5x+ =8+ .12、下列说法中正确的是( )A 、等式两边各加上一个式子,所得结果仍是等式B 、等式两边各乘以一个数,所得结果仍是等式C 、等式两边都除以同一个数,所得结果仍是等式D 、一个等式的左右两边分别与另一个等式的左右两边相加,所得结果仍是等式13、方程032=+-my是一元一次方程,则m= 14、若方程()0122=++-c bx x a 是关于x 的一元一次方程,则字母系数a 、b 、c 的值满足( ) A 为任意数c b a ,0,21==B 0,0,21=≠≠c b a C 0,0,21≠≠=c b a D 为任意数c b a ,0,21≠= 15、已知51=-a 则a 的值是( ) A 6 B -4 C 6或-4 D -6或416、检验下列各数是不是方程x x 2725+=-的解(1) x=3 (2) x=517、已知6x=3+5x,下列变形,正确的是( )A 6x -5x=3B 6x+5x=3C 6x=3D 6x -5x=018、已知a=b,下列各式中:b a a b a b a b a +=+=-+=+-=-2,88,55,33,正确的有( )A 1个B 2个C 3个D 4个19、已知m+a=n+b,利用等式性质可变形为m=n 那么a ,b 必符合条件( )A b a -=B a=bC b a =-D a ,b 为任意有理数或整式20、下列运用等式的性质对等式进行的变形中,正确的是( )A 55,+=-=y x y x 则若B bc ac b a ==则若,C b a c b c a 32,32==则若D by a x y x ==则若, 21、如果ba 510=那么a= 。
第九周微测试测试内容:Unit 4 Section B ~ Self Check Ⅰ.把图片和相应的英语连起来。
1. A. clock2. B. plane3. C. radio4. D. tape Ⅱ.根据汉语提示写单词。
5. Frank's room is ( 整洁的).6. Is this your (播放机)?7. Mr. Smith is (我们的) math teacher.8.He is (总是) in the library.9.look,a (飞机) is in the sky(天空).10. In Lily's room , books are (到处).Ⅱ.用所给词的适当形式填空。
11. The tape_ _ ( play) is on the teacher's desk.12. 一What are these ( thing)?- They are CDs.13. A ball is in his ( son) room.14. My books and pens ( be) in the schoolbag.15. The English books are ( she).Ⅳ.单项选择。
( )16. 1 have a brother two sisters,I don't have cousins.A. and;butB. and ;andC. but ;andD. but;but( )17.In room.some are in the bookcase.A. they ;bookB. yours ; booksC. our;booksD. ours ; books( ) 18. I don't your telephone number.A. knowB. helpC. thinkD. spell( )19. My brother always me.A. askB. asksC. to askD. asking( )20.-the red radio player?--on the table.A. Where are ;They'reB. Where's;They`reC. Where are;I'sD. Where's;I'sV.句型转换。
【七年级】2021年七年级数学上册第九周周末作业阜宁县陈集中学七年级数学周末作业(第九周)一、:(以下每个问题只有一个正确答案。
请选择并填写问题后的方框。
每个子问题3分,共24分)1.的倒数是()a、不列颠哥伦比亚省。
2.下列四个数中,在到0之间的数是a、不列颠哥伦比亚省。
3.图中所画的数轴,正确的是4.在下面的表达式中,不等于的是()a.b.c.d.5.以下陈述是正确的()a.有理数的绝对值一定是正数b.如果两个有理数的绝对值相等,那么这两个有理数一定相等c、负数的绝对值是其相反的数字D。
绝对值越大,数字越大6.下面的说法正确的是()a、 B.和是同类产品吗c.是五次单项式d.是二次三项式7.如果数字轴上的数字位置如图所示,则为()a.正数b.负数c.零d.无法确定8.下列方格中的四个数字具有相同的规律。
根据这条法律,价值是()a.b.c.d.问题编号:12345678答案二、问题:(每个子问题3分,共30分)9.中国是严重缺水的国家之一,人均淡水资源为世界人均量的四分之一,所以我们为中国节水,为世界节水.若每人每天浪费水0.32l,那么100万人每天浪费的水,用科学记数法表示为l.10.比较大小:(填写“>”或“<”)11.写出一个含有字母的二次三项式.12.阜宁县杨寨镇生产的苹果包装箱表明苹果质量为公斤。
如果这盒苹果重17.98kg,那么这盒苹果的质量标准(填写“合格”或“不合格”)13.某校去年初一招收新生人,今年比去年减少20%,用代数式表示今年该校初一学生人数为.14.图为简单的数值运算程序框图。
如果输入值为,则输出值为15.已知代数式式的值是,则代数式的值是.16.计算:17.已知数轴上的点a表示的数是,把点a移动个单位长度后,点a表示的数是.18.连续对折厚度为0.1倍的纸张,使对折后整叠纸张的总厚度超过25倍,至少两次三、解答题:(66分)19.计算(每题4分,共16分)(1)(2)(3)(4)20.化简(每小题4分,共8分)(1)(2)21.先化简,再求值(每小题4分,共8分).(1),(2)22.(6分)张晓明为自己记下了新年的钱。
七年级英语上册第九周周演练修订人:王梅芳班级姓名得分一、根据句意和首字母,完成单词拼写。
1. He doesn’t play sports, he only w________ them on TV.2. My father has a g________ sports collection.3. Do you have a c________ game?4. L________ play volleyball.5. Do you have a b________ bat?二、单项选择。
( )1. I don’t have a volleyball, but my brother has ________.A. aB. itC. oneD. an( )2. ________ a basketball?A. Do you haveB. Are you haveC. Are youD. Do you are have ( )3. ―Let’s play baseball. Do you have a baseball bat?―________.A. Sorry, I doB. Sorry, I don’tC. Yes, I don’tD. Yes, I can ( )4. ―Let’s watch TV.―________.A. That’s sound goodB. That sounds wellC. That’s sounds wellD. That sounds good( )5. ―Does Tom join us?―________.A. Yes, I doB. Yes, he doC. No, he doesn’tD. No, he don’t ( )6. They are my good friends. I love ________ and they love ________.A. they, IB. them, meC. them, ID. they, me ( )7. We watch every basketball game on ________TV.A. aB. anC. theD. /( )8. The girl ________ every Sunday.A. play sportB. plays sportC. play sportsD. plays sports ( )9. Does she like ________?A. play soccerB. playing ping-pongC. play volleyballD. plays basketball ( )10. ―Can you give me a hand?―________A. You’re welcome.B. No, I can’t.C. Sure, what’s wrong?D. Yes, I could.三、按要求改写下列各句, 每空一词。
七年级英语上册Unit9练习题班级考号姓名总分一、根据句意及首字母或汉语提示完成单词1.My f_______ colour is green.2.I have one ______ (课) on the afternoon of Friday.3.I like English b______ it is interesting.4.This movie is so _____ (妙极了), I like it very much.5.S______ comes after Friday.6.I will ______ (完成) our homework in an hour.7.W_____ are you late for school?8.I am _____ (空闲的) today.9.I go to school f_____ Monday to Friday.10.This book is _______ (有用的).二、用所给词的适当形式填空1.Chinese and English are my favorite ________ (subject).2.Lily often _____ (have) music lessons on Wednesday.3.There are twenty - four ______ (hour) in a day.4.We will finish ______ (work) next week.puter is a _____ (use) invention.6.This lesson is ______ (bore), I don’t like it.7.Can he _____ (play) the guitar?8.I want ______ (know) about your family?9.My mother is busy _______ (cook).10.Please ______ (ask) that man.三、单项选择( )1.We have two lessons ____ Friday afternoon.A.atB.inC.onD.for( )2.The man often finishes _____ TV at 12:00 pm.A.watchingB.watchesC.watchD.to watch( )3.Today we have _____ lessons in the morning, the _____ is English.A.four; threeB.fourth; threeC.four; thirdD.fourth; third( )4.Science is difficult _____ fun.A.butB.andC.orD.so( )5._____ is the fifth day in a week.A.WednesdayB.ThursdayC.FridayD.Saturday( )6.--_____ do you like math?-- Because it is interesting.A.WhenB.WhyC.WhereD.What( )7.______favorite subject is English.What about you?A.IB.MyC.MeD.Mine( )8.My teacher _____ that we are free tomorrow.A.sayB.saysC.sayingD.to say( )9.I think English is _____ useful subject.A.anB.aC./D.the( )10.--______-- It’s OK.I have fun playing basketball.D.He is a lovely dog.E.Mr.Smith is.F.I don’t like our math teacher.G.What’s my favorite subject?八、句型转换1.I like English because it is interesting.(就划线部分提问)_____ _____ _____ like English?2.We have two Chinese lessons on Monday.(就划线部分提问)_____ _____ ____ ____ two Chinese lessons?3.My favorite subject is math.(就划线部分提问)_____ _____ _____ subject?4.always, with, he, us, games, plays (连词成句)_________________________5.on; I; busy; am; Friday; very (连词成句)_________________________附:参考答案一、1.favorite 2.lesson 3.because 4.cool 5.Saturday6.finish7.Why8.free9.from eful二、1.subjects 2.has 3.hours 4.working eful6.boring7.play8.to know9.cooking 10.ask三、1 -- 5 CACAB 6 -- 10 BBBBA四、1.from; to2.have two English lessons3.plays with4.Is that OK with you?5.That's for sure.五、1 -- 5 ECBDA六、1.fly 2.take 3.goes 4.buys 5.have6. visit7.see8.like9.are七、1 -- 5 BFEGD八、1.Why do you2.When do you have3.What's your favorite4.He always plays games with us.5.I am very busy on Friday.。
初中英语学习材料madeofjingetieji樟木头中学2016—2017学年度第一学期七年级英语周测试卷—Unit 9(总分:100分;时间:25分钟)班级______________ 姓名____________ 学号____________分数_______________一、单项选择。
(40分)( )1. This is ________ useful book. I want to buy it.A. aB. anC. theD. /( )2. Jerry, what do you usually do ________ Saturday evening?A. inB. onC. atD. of( )3.— What day is it today? —It’s Wednesday. And the next day is ________.A. MondayB. ThursdayC. FridayD. Saturday( )4.— Jeff, do you like history? —Yes. It’s my favorite ________.A. colorB. sportC. foodD. subject( )5.— You look really ________ in that black T-shirt, John.— Thank you.A. shortB. fatC. coolD. old( )6.— John, are you ________ this afternoon?— Yes. Let’s play basketball.A. rightB. freeC. tidyD. happy( )7.— When does your school ________ in the afternoon?— At 4:00. And after school I always play soccer with my friends.A. haveB. takeC. knowD. finish( )8. We only have one music ________ in a week.A. teacherB. bookC. lessonD. room( )9.— ________ do you like Mrs. Yang?— Because she is fun.A. WhyB. WhenC. WhatD. Who( )10.— I think Ms. Cao is great fun. — ________. All her students like her.A. That’s for sureB. That sounds funC. You’re welcomeD. I don’t know( )11. After class, I have gymnastics ______ two hours.A. onB. atC. forD. In( )12. I’m ________ you are right.A. sureB. sorryC. thinkD. know( )13. We have math ________ Friday. ——It’s difficult ________ interesting.A. on, orB. on, butC. in, orD. in, and( )14. What’s ______ favorite movie?A. heB. sheC. he’sD. Gina’s( )15. The game ______ at 4:00 p. m.A. finishB. finishesC. finishsD. to finish( )16. --______ do you like biology? --It’s fun.A. WhatB. WhenC. WhyD. How much( )17. I think math is ________.A. real difficultB. really difficultC. real busyD. really tired( )18. ________? ——It’s December 12th.A. What day is it todayB. What’s the timeC. What’s the date todayD. Is it Monday today( )19. What ____ does he like best? ——Football.A. foodB. subjectC. colorD. sport( )20. What _______ you do after supper?A. doesB. doC. isD.are二、完形填空。
Unit 9周清卷My favorite subject is science.(满分:100分)班级______ 姓名________ 学号________ 得分_____________一、词汇大乐园(20分)1.lesson_________ 6.Wednesday_______ 11.小时___________ 16.空闲的eful__________ 7.cool____________ 12.星期天_________ 17.上午___________3.Monday________ 8.math___________ 13.音乐___________ 18.在星期五_______4.from...to..._______ 9.why____________ 14.无疑___________ 19.科目___________5.history_________ 10.Chinese________ 15.因为___________ 20.为什么二、单项选择。
(30分)( )21. —What's your favorite color? —My favorite color is ______.A.baseball B.science C.hamburger D.white( )22. We have ________ every day.A. a ChineseB. ChineseC. the ChineseD. an Chinese( )23. I don’t want that T-shirt _______ it’s too big for me.A. afterB. butC. becauseD. so( )24. —Are you _______ today, Linda? —No. I have many things to do.A. freeB. tidyC. lateD. fine( )25. He usually finishes ______ TV at 12:00.A.watching B.watches C.watch D.to watch( )26. The first day of the week is ________.A. MondayB. FridayC. SundayD. Thursday( )27. We have art ________Thursday. It's fun ________relaxing.A. on; andB. in; andC. on; butD. in; but( )28. —What color _______ your sister _______? —White.A. do; likeB. does; likeC. do; likesD. does; likes( )29. —_______? —Linda.A. Where do you make saladB. How do you make saladC. Why do you make saladD. Who can make salad( )30.Do you want ________an English class?A. haveB. hasC. to playD. to have( )31. They ______ busy doing their homework.A.is B.am C.are D./( )32.—Jane, what _______ does your brother like? —He likes art.A. subjectB. gameC. sportD. trip( )33.—________ do you like science? —Because it’s interesting.A. WhatB. WhyC. WhenD. Where( )34. Today we have ______ classes,and the ______ class is math.A.three;tree B.first;three C.three;third D.third;three( )35.This term I’ll have _______. I need a map of the world(世界).A. mathB. geographyC. scienceD. music三、根据句意用括号内所给词的适当形式填空。
七上第九周周末练习《数学》
班级: 姓名:
一、选择题(每小题5分,共35分)
1.比较-3,1,-2的大小,下列排序正确的是( )
A.-3<-2<1
B.-2<-3<1
C.1<-2<-3
D.1<-3<-2
2.为了市民出行更加方便,某市政府大力发展交通,2016年某市公共交通客运量约为1 608 000 000人次,将1 608 000 000用科学记数法表示为( )
A.160.8×107
B.16.08×108
C.1.608×109
D.0.160 8×1010
3.某市一天上午的气温是10 ℃,下午上升了2 ℃,半夜(24时)下降了15 ℃,则半夜的气温是( )
A.3 ℃
B.-3 ℃
C.4 ℃
D.-2 ℃
4.下列运算错误的是( )
A.-8×2×6=-96
B.(-1)2 014+(-1)2 015=0
C.-(-3)2=-9
D.2÷ 43× 34
=2 5.如图1-2,A ,B 两点在数轴上表示的数分别为a ,b ,下列式子成立的是( )
A.ab >0
B.a +b <0
C.(b -a )(a +1)>0
D.(b -1)(a -1)>0
6.若|a -1|+(b +3)2=0,则ba =( )
A.1
B.-1
C.3
D.-3
7.规定一种新的运算“*”:对于任意有理数x ,y 满足x *y =x -y +xy .例如,3*2=3-2+3×2=7,则2*1=( )
A.4
B.3
C.2
D.1
二、填空题(每小题4分,共36分)
8.一个点从数轴上表示-1的点开始,先向右平移6个单位长度,再向左平移8个单位长度,则此时这个点表示的数是_____.
9.在数-5,1,-3,5,-2中任取三个数相乘,其中最大的积是____,最小的积是_____.
10.已知a ,b 互为相反数,且|a -b |=6,则b -1=____.
11.已知|x |=4,|y |=1
2,且xy <0,则 x y
的值等于_____. 12.将640 000精确到十万位为_______,4.10×105精确到了_____位.
13.定义一种新的运算“@”的法则为:x @y =xy -1,则(2@3)@4=______.
14.计算:1+2-3-4+5+6-7-8+9+10-11-12+……-2007-2008+2009+2010-2011-2012+2 013=______.
三、解答题(共29分)
20.(20分)计算:
(1)1137
(3)()
63412
+-÷-+-;(2)-23+(-2)2×(-1)-(-2)4÷(-2)3;
(3)
11311
()()
6841248
--+-÷-;(4)23
29
24
×(-12).
21.(9分)如图,一个单位长度表示2,解答下列问题:
(1)若点B与点D所表示的数互为相反数,求点D所表示的数;
(2)若点A与点D所表示的数互为相反数,求点D所表示的数;
(3)若点B与点F所表示的数互为相反数,求点D所表示的数的相反数.。