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初一数学期末综合练习题2

初一数学期末综合练习题2

初一数学期末综合练习题21. 用“☆”定义一种新运算:对于任意有理数a 和b ,规定a ☆b =22ab ab a ++. 如:1☆3=2132131⨯+⨯⨯+=16. (1)求(-2)☆3的值;(2)若(12+a ☆3)☆(-12)=8,求a 的值; (3)若2☆x =m ,1()4x ☆3=n (其中x 为有理数),试比较m , n 的大小.2.如图1,AOB =α∠,COD β∠=,OM ,ON 分别是∠AOC ,∠BOD 的角平分线.(1)若∠AOB =50°,∠COD =30°,当∠COD 绕着点O 逆时针旋转至射线OB 与OC 重合时(如图2),则∠MON的大小为______________;(2)在(1)的条件下,继续绕着点O 逆时针旋转∠COD ,当∠BOC =10°时(如图3),求∠MON 的大小并说明理由;(3)在∠COD 绕点O 逆时针旋转过程中,∠MON =__________________________.(用含αβ,的式子表示).图3N MDCB OA图2 NMD(C )B OA图1N M DCB A3、如图,A 、C 两点在直线L 上,AC=6,D 为射线CM 上一点,CD=7,若在A 、C 两点之间栓一根橡皮筋,“奋力牛”Q 拉动橡皮筋在平面内爬行,爬行过程中始终保持QA=2QC 。

(1)若Q 点在直线L 上,○1请在图中标出Q 的位置○2直接写出QC 的长度 (2)在“奋力牛”爬行过程中,2QD+QA 的最小值是_____________4、在数轴上,点A 向右移动1个单位得到点B ,点B 向右移动(n+1)(n 为正整数)个单位得到点C ,点A 、B 、C 分别表示有理数a 、b 、c(1)当n=1时,A 、B 、C 三点在数轴上的位置如图所示,a 、b 、c 三个数的乘积为正数。

○1数轴上原点的位置可能() A 、在点A 左侧或在A 、B 两点之间 B 、在点C 右侧或在A 、B 两点之间 C 、在点A 左侧或在B 、C 两点之间 D 、在点C 右侧或在B 、C 两点之间 ○2若这三个数的和与其中的一个数相等,则a=_______________ (2)将点C 向右移动(n+2)个单位得到点D ,点D 表示有理数d ,a 、b 、c 、d 四个数的积为正数,且这四个数的和与其中的两个数的和相等,a 为整数。

苹果园中学初一英语语法练习题2

苹果园中学初一英语语法练习题2

英语专项练习题1、()“Where is your sister?”“She has gone().”A.upstairsB.in the upstairsC.for the upstairsD.to upstairs参考答案:C2、()Nobody knows()to visit our school.A.when will be comeB.when does he comeC.when he will comeD.when he does come参考答案:C3、()What date is it?It’s().A.July twentieth-firstB.of July twenty-firstC.the twenty-first of JulyD.a quarter to twelve参考答案:D4、()It’s very important()me to say something()you.A.for,forB.to,toC.for,toD.to,for参考答案:C5、()Mary lost her pen,()?A.didn’t sheB.didn’t MaryC.doesn’t sheD.wasn’t she参考答案:A6、()What do you mean()saying so?A.withB.ofC.forD.by参考答案:B7、()They failed six times,but they have decided to try().A.seven timesB.the seven timeC.the seventh timeD.seventh time参考答案:C8、()How many English parties()by the end of last term?A.had you hadB.had you haveC.have you hadD.did you have参考答案:A9、()he was very tired,he went on working without any rest.A.BeforeB.ButC.ThoughD.As参考答案:C10、()He is so careful that he always looks over his exercises to()there are no mistakes.A.make sureB.find outC.think aboutD.try out参考答案:A11、()The field was full()sheep and they were lying()the ground.A.with,onB.of,onC.with,inD.of,onto参考答案:D12、()Mr.Smith()here since he moved to his city.A.had livedB.have liveC.have livedD.has lived参考答案:D13、()In the forties,his father served in the New()Army(新四军),while this mother worked in the()Route Army.(八路军)A.the twenty-first lessonB.Lesson Twenty FirstC.the 21th lessonD.Lesson 21th参考答案:B14、()There are()in the garden.A.a kind of flowerB.all kinds of flowersC.a few kind of flowersD.a few kinds of flower参考答案:B15、()The whole trip cost()about three thousand dollars.A.the Smith’sB.SmithsC.the SmithsD.the Smith参考答案:C16、()His sister is()than he.A.older four yearsB.four years olderC.elder four yearsD.four years elder参考答案:B17、()We don’t understand the passage()there are some new words in it.A.andB.ifC.thoughD.because参考答案:C18、()--Is the TV set OK now?--I’m sure there’s()with the TV set.You can take it home.A.something wrongB.serious somethingC.nothing wrongD.some wrong things参考答案:C19、()How many()are there in your family?A.peoplesB.the peopleC.peopleD.some people参考答案:C20、()You must do()I told you.A.afterB.beforeC.whereD.as参考答案:D21、()He drives much()than be did three years ago.A.more carefulB.more carefullyC.carefulD.carefully参考答案:B22、()Neither he nor I()form Canada.We are from Australia.A.isB.areC.amD.be参考答案:C23、()He is one of()in the country.A.the most popular football playersB.the most popular football playerC.the more popular football playersD.most popular football players参考答案:A24、()He chose()English names.A.talking aboutB.talking onC.to talk aboutD.to talk on参考答案:C25、()When he was(),he left home to work in different cities.A.in his twentyB.at his twentyC.in his twentiesD.at his twenties参考答案:C26、()Stamps()by people for sending letters.eingedD.are used参考答案:D27、()This is the biggest tiger()has ever been shown in the zoo.A.thatB.whichC.whoD.whom参考答案:A28、()A:How()do you go shopping?B:Once a week.A.manyB.muchC.longD.often参考答案:D29、()Will you make()with Tom?A.friendC.friendsD.the friend参考答案:C30、()We call John Henry Brown().A.Mr.JohnB.Mr.HenryC.Mr.BrownD.Mr.John Henry参考答案:C31、()are falling in Autumn.A.LeafsB.LeavseC.LeavesD.Leafes参考答案:C32、()Do you know the()“There is no use()over the spilt milk?”A.word,cryB.saying,cryingC.saying,cryD.word,crying参考答案:B33、()These apples look().A.niceB.wellC.sweetlyD.nicely参考答案:A34、()Mary()dress is all white,looks very pretty.A.whoB.whomC.whoseD.that参考答案:C35、()Have you got()?A.enough the breadsB.enough breadC.enough of the breadD.enough the bread参考答案:B36、()Look()the blackboard.Don’t look out()the window.A.in,fromB.to,withC.to,to参考答案:C37、()Hello,Lucy,()good news for you.A.I have aB.There is aC.There are someD.There is some参考答案:D38、()Can you believe that in()a rich country there should be()many poor people?A.such,suchB.so,soC.so,suchD.such,so参考答案:D39、()Speak English()possible in class and after class.A.as many asB.as soon asC.as much asD.as more as参考答案:C40、()They()tired so they stopped()a rest.A.are,haveB.were,haveC.were,to haveD.are,having参考答案:C。

初一暑假同步练习2

初一暑假同步练习2

初一暑假同步练习--- 数轴(1)班级: 姓名: 得分:一、选择题(每小题4,共20分) 1、下列数轴的画法正确的是( )2、在数轴上表示-2的点离开原点的距离等于( )A 、2B 、-2C 、±2D 、43、有理数a 、b 在数轴上的位置如图所示,则a 、b 的大小关系是( ) A 、a <b B 、a >b C 、a=b D 、无法确定4、下列说法中,其中不正确的是( )A 、0是整数B 、负分数一定是有理数C 、一个数不是正数,就一定是负数D 、0 是有理数 5、下列说法中正确的有( )①0是取小的自然数;②0是最小的正数;③0是最小的非负数;④0既不是奇数,也不是偶数;⑤0表示没有温度。

A 、1个B 、2个C 、3个D 、4个 二、填空题(每小题4分,共40分)1、在数轴上表示-4的点位于原点的________边,与原点的距离是________个单位长度。

2、比较大小,在横线上填入“>”、“<”或“=”。

1________0;0________-1;-1________-2;-5________-3;-2.5________2.5. 3、数轴上与原点距离是5的点有________个,表示的数是________。

4、已知x 是整数,并且-3<x <4,那么在数轴上表示x 的所有可能的数值有________________。

5、在数轴上,点A 、B 分别表示-5和2,则线段AB 的长度是________。

6、从数轴上表示-1的点出发,向左移动两个单位长度到点B ,则点B 表示的数是________,再向右移动两个单位长度到达点C,则点C 表示的数是________。

7、 数轴上的点A 表示-3,将点A 先向右移动7个单位长度,再向左移动5个单位长度,那么终点到原点的距离是________个单位长度。

8、在数轴上P 点表示2,现在将P 点向右移动两个单位长度后再向左移动5个单位长度,这时P 点必须向________移动________个单位到达表示-3的点。

宝山中学初一英语语法练习题2

宝山中学初一英语语法练习题2

英语专项练习题1、()The new houses were built()young trees.A.amongB.onC.withD.into参考答案:A2、()My father has gone to New York.He’ll be back()four months.A.afterB.interD.for参考答案:D3、()No news()good news.A.isB.seemsC.haveD.has参考答案:A4、()We have()milk for baby.You’d better go and buy some.A.littleB.a littleC.fewD.a few参考答案:A5、()The train()when we got to the station.A.has just leftB.had just leftC.leavesD.left参考答案:B6、()I think that the()century will bring us more hopes.A.twenty-oneB.twentieth-firstC.twenty-firstD.twentieth-one参考答案:B7、()——Can you understand me?——Sorry,I can()understand you.A.hardlyB.almostC.nearlyD.ever参考答案:A8、()——Would you like to eat()apples?——No,thank you.A.more twoB.two moreC.two anotherD.two else参考答案:D9、()Don’t play football here,()you may break the window.s.A.orB.butC.andD.so参考答案:A10、()y friend,Miss Chen,lives()the other side of the street.A.byB.forC.inD.on参考答案:A11、()ck with his wife()visiting China now.A.areB.isC.wereD.was参考答案:D12、()——Have you mended the motorbike,Tom?——Yes,I()it ten minutes ago.A.haveB.hadC.mendedD.have mended参考答案:C13、()The radio says that it may stop().A.to rain laterB.and rain laterC.raining laterD.to raining later参考答案:C14、()He made()mistakes in the last exam.A.the leastB.fewerC.the fewestD.less参考答案:C15、()Are my books on the table?No,ther e()on the table.A.aren’t anythingB.isn’t anythingC.aren’t somethingD.isn’t some thing参考答案:B16、()Granny Lin often()us()interesting story in the evening.A.tell,aB.tells,anC.tell,anD.tells,a参考答案:B17、()Li Lei’s handwriting is better than any other()in his class.A.studentsB.studentC.student’sD.students’参考答案:C18、()I forgot()France.A.he has gone toB.he had been toC.he wentD.he had gone to参考答案:D19、()the time the bell rang,every student of the class was busy().A.At,readingB.By,readingC.To,to readD.For,to read参考答案:B20、()Li Ping is good()maths,but he is weak()English.A.at,atB.at,inC.in,inD.in,at参考答案:D21、()You don’t think so,()?A.don’t youB.aren’t youC.are youD.aren’t you参考答案:B22、()What do you usually do after()?A.the classB.classD.a class参考答案:B23、()His()new books.A.isB.amC.wasD.are参考答案:D24、()——You should take(),I think.A.healthB.exerciseC.lessonD.time参考答案:B25、()Most of the business letters around the world are written()English language.A.in theB.inC.withD.with the参考答案:A26、()Don’t read()the sun.It’s bad()your eyes.A.in,forB.under,toC.in,withD.under,for参考答案:D27、()Now these magazines()in the library for a long time.A.have keptB.were keptC.have been keptD.had kept参考答案:C28、()I like autumn()I can have a lot of fruit.A.butB.ifC.thoughD.because参考答案:D29、()——Is there a cat near the chair?——Yes,().A.it isB.they areC.there isD.there are30、()He writes more carefully than()in his class.A.any studentB.any other studentC.any other studentsD.all students参考答案:B31、()Can you see a little()in the picture?A.sheepB.dogsC.pigsD.horses参考答案:A32、()There()sheep in the field.A.is smallB.are muchC.are a fewD.are a little参考答案:D33、()She is()at swimming,she can swim().A.good,wellB.well,goodC.better,bestD.well,well参考答案:B34、()What()on Sunday?A.does he sometimes doB.is he often doingC.has he doneD.is usually he do参考答案:A35、()There are()people in the USA than in China.A.manyB.a fewC.fewerD.a fewer参考答案:B36、()Work harder,()you’ll catch up with the others.A.andB.butC.orD.so参考答案:D37、()What date is it?It’s().A.July twentieth-firstB.of July twenty-firstC.the twenty-first of JulyD.a quarter to twelve参考答案:D38、()Here are some presents()you()our best wishes.A.for,forB.with,forC.for,withD.with,with参考答案:C39、()was pleased at the good news.A.All cityB.Whole the cityC.The all cityD.The whole city参考答案:D40、()What()we are having today!A.fine weatherB.a fine weatherC.fine weathersD.fine a weather参考答案:A。

练习-初一数学周末练习2(二元一次方程组的应用)

练习-初一数学周末练习2(二元一次方程组的应用)

初一数学周末练习(二)
本周习题:
1、汽车队运送一批货物,若每辆装3.5吨,就要剩下3吨货物;若每辆装4吨,则可少用一辆车,问汽车有几辆?货物有几吨?
2、某中学有住宿生若干人,若每间宿舍住8人,则有5人无处住;若每间宿舍增加1人,则还空35张床位,问有宿舍几间,住宿生有几人?
3、两地相距500千米,甲、乙两列火车由两地相向而行。

若同时出发,则5小时相遇;若乙先出发5小时,则甲出发3小时后相遇,求两车的速度?
4、甲乙两人从相距36千米的两地相向而行,若甲先出发2小时,则在乙动身2.5小时后两人相遇,若乙先出发2小时,则在甲动身3小时后相遇,求甲、乙二人的速度。

5、甲乙两人在400米的跑道上练习跑步,如果同方向跑,他们每隔3分零20秒就相遇一次,如果相对而跑,他们每隔40秒相遇一次,求甲、乙二人的速度。

6、用水管向水池注水,在甲管注到水池的2/5时,改用乙管继续注水,共用7小时注满;若在甲管注满水池的1/5时,改用乙管,则可较前少用2小时注满,问单独用甲、乙两管注满水池各需几小时?
参考答案:
1、14辆,52吨
2、40间,325人
3、甲60km/h,乙40km/h
4、甲6km/h,乙3.6km/h
5、甲乙两人中跑得快的人速度是360米/分,跑得慢的人速度是240米/分
6、甲13小时,乙3小时。

初中七年级(初一)数学下册课时练习2含答案解析

初中七年级(初一)数学下册课时练习2含答案解析

初中七年级(初一)数学下册课时练习卷I一.选择题(共5题)1.一个数若有两个不同的平方根,则这两个平方根的和为()A. 大于0B. 等于0C. 小于0D. 不能确定2.已知(x+a)(x+b)=x2-13x+36,则a+b的值为( )A. -13B. 5C. -13或5D. -53.A. B. C. D.4.某一组数据中,已知最大值是84,最小值是52,若分成6组,且组距为整数,某组组中值为72.5,则这组数据可能是( )A. 51.5~57.5B. 69.5~75.5C. 68.5~76.5D. 70.5~74.55.星期六,小亮从家里骑自行车到同学家去玩,然后返回,图是他离家的路程y(千米)与时间x(分钟)的函数图象,根据图象信息,下列说法不一定正确的是()A.小亮到同学家的路程是3千米B.小亮在同学家逗留的时间是1小时C.小亮去时走上坡路,回家时走下坡路D.小亮回家时用的时间比去时用的时间少二.填空题(共3题)1.如图,在同一平面内有A,B,C,D,E五个点,过其中任意两点画直线最多可以画________条.2.如图,若∠AOB与∠BOC是一对邻补角,OD平分∠AOB,在∠BOC内部,并且∠BOE=∠COE,∠DOE=72°,则∠COE的度数是_____.3.计算:(2x﹣3)(x+1)=_____.三.解答题(共3题)1.某地区现有果树24000棵,计划今后每年栽果树3000棵.①试用含年数x(年)的式子表示果树总棵数y(棵);②预计到第5年该地区有多少棵果树?2.如图所示,小王想测量小口瓶下半部的内径,他把两根长度相等的钢条AA′,BB′的中点连在一起,A,B两点可活动,使M,N卡在瓶口的内壁上,A′,B ′卡在小口瓶下半部的瓶壁上,然后量出AB的长度,就可量出小口瓶下半部的内径,请说明理由.3.如图,两直线AB,CD相交于点O,OE平分∠BOD,OF⊥OE,如果∠AOC:∠AOD=7:11,求∠COF的度数.卷I参考答案一.选择题1.【答案】B【解析】当一个数有两个不同的平方根的时候,这两个平方根互为相反数,所以它们的和等于0,故选B.2.【答案】A【解析】利用公式(x+a)(x+b)=x2+(a+b)x+ab,可直接求出a+b.(x+a)(x+b)=x2+(a+b)x+ab,又∵所以,a+b=−13.故选:A.3.【答案】B【解析】将-a-b整理成-(a+b),即可运用平方差公式进行计算.解:(a-b)(-a-b)=-(a-b)(a+b)=-(a2-b2)=-a2+b2.故选B.4.【答案】B【解析】依题意求出组距即可判断.数据的极差为84-52=32,32÷6=5.3,即组距为6,故72.5可能在69.5~75.5中.5.【答案】C【解析】解:A、由图象可知,小亮离家3千米后,路程不再变化,说明小亮到他同学家的路程是3千米,A 不符合题意;B、路程保持3千米的时间为80-20=60分钟,也就是1小时,说明小亮在同学家逗留的时间是1小时,B不符合题意;C、从题目与图象中无法看出是否有上坡与下坡的路段,C符合题意;D、去时用的时间为20-0=20分钟,回家时用时间为95-80=15分钟∴小亮回家时用的时间比去时用的时间少,D不符合题意。

黄土岗中学初一英语语法练习题2

黄土岗中学初一英语语法练习题2

英语专项练习题1、()——Can you understand me?——Sorry,I can()understand you.A.hardlyB.almostC.nearlyD.ever参考答案:A2、()I don’t know()the shoes()cheap enough.A.if,areB.where,wasC.that,wasD.if,was参考答案:A3、()Twelve()were hurt,but no()were lost in that accident.A.person,lifeB.people,livesC.peopeles,livesD.persons,life参考答案:B4、()Somebody borrowed my bike yesterday,()?A.didn’t theyB.did theyC.did heD.doesn’t he参考答案:C5、()Look!The children are playing(),they are always().A.happy,happyB.happily,happilyC.happily,happyD.happy,happily参考答案:C6、()When Mr.Brown came yesterday,his family()having supper.A.isB.areC.wasD.were参考答案:D7、()All the people were sad()the news.A.toB.forC.atD.with参考答案:D8、()I don’t know().A.when startB.when to startC.to how startD.how start参考答案:B9、()I was good()learning()others.A.in,toB.in,inC.at,fromD.at,/参考答案:C10、()This shirt is not good.The one is even().A.betterB.worseC.wellD.worst参考答案:B11、()The boy is clever,(),he often makes mistakes.A.andB.howeverC.whenD.or参考答案:C12、()Five minus three()two.A.isB.areC.amD.were参考答案:B13、()You look ill.()anything wrong with you?A.HaveB.Are thereC.HasD.Is there参考答案:D14、()I have never seen()flower before.It’s wonderful.A.such a beautifulB.a such beautifulC.so a beautifulD.a so beautiful参考答案:A15、()Xi’an is one of()capital()in China.A.older,cityB.the older,cityC.oldest,citiesD.the oldest,cities参考答案:D16、()Tom works very hard,()his family is still very poor.A.yetB.forC.soD.and参考答案:D17、()Don’t make noise.Please keep().A.quietB.quietlyC.quiteD.more quietly参考答案:A18、()He doesn’t feel like()anything.A.eatB.to eatingC.eatingD.ate参考答案:C19、()The children said()they()themselves very much.A.if,enjoyB.why,enjoyedC.where,enjoyD.that enjoyed参考答案:D20、()Jim has been in the factory for two years()he left school.A.whenB.sinceC.as soon asD.whether参考答案:D21、()you working hard!A.WhatB.HowC.AreD.Aren’t参考答案:C22、()Go straight along the street,turn to the left at the end of the street and()you’ll fine theA.thenB.soC.butD.yet参考答案:B23、()Lucy and Lily are()trouble,why not ask()help?A.in,forB.in,toC.with,forD.with,to参考答案:C24、()says,there will be rain in()nigh.()rain will be very heavy in some()places.A.Today’s weather report,/,The,theB.The weather report of today,/,the,/C.Today’s weather report,the,The,/D.Today weather report,the,/,/参考答案:C25、()I()her to bring my book to school yesterday.A.toldB.tellC.am tellingD.have told参考答案:A26、()In those years our life was()than that of animals.A.badB.worseC.worstD.badly参考答案:A27、()We want you to()your work in China.A.talk atB.talk toC.talk aboutD.talk with参考答案:C28、()Don’t get off until the bus().A.will stopB.is stoppingC.is going to stopD.stops参考答案:D29、()Ask the boy not to make any().I can’t fall asleep.A.voiceC.noiseD.singing参考答案:C30、()He is often()for school.tertetestD.much late参考答案:B31、()Miss Li likes the students()questions.A.askB.askingC.to askD.asked参考答案:C32、()——Can you come on Friday or Saturday?---I’m afraid()day is possible.A.eitherB.someC.anyD.neither参考答案:D33、()Do you sleep()every night?A.badB.niceC.wellD.good参考答案:C34、()He didn’t do his homework,()his teacher was very angry.A.butB.yetC.orD.so参考答案:C35、()Are you going to play basketball()football this afternoon?A.andB.orC.butD.so参考答案:A36、()The man in the chair is()an engineer()a manager.A.no,butB.both,andC.or,norD.neither,nor参考答案:D37、()They()next Wednesday,aren’t they?A.will leaveB.are going to leavingC.are leavingD.aren’t going to leave参考答案:C38、()He said he had seen()strange things like saucers.A.a lotB.someC.muchD.any参考答案:B39、()Li Ping is taller than Wnag Hai but shorter than Wu Dong.His seat is()Wang Hai’s()Wu Dong’s.A.behind…in afterB.behind…in front ofC.in front of….behindD.between…and参考答案:D40、()There was()just now.A.the cold rainB.cold rainC.cold rainsD.a cold rain参考答案:D。

初一下学期数学培优练习二

初一下学期数学培优练习二

初一年下学期数学培优练习二第6章 《一元一次方程》 B 卷一、选择题1.(2016年厦门期末)已知5是关于x 的方程ax +b =0的解,则关于x 的方程a(x +3)+b =0的解是( )A. -3B. 0C. 2D. 52.(2016年厦门期末)一个两位数的个位数字的2倍再加上5,再把所得的结果的5倍,加上十位数字,减去25后等于43.则这个两位数的个位数字与十位数字的和是( )A.2B.7C. 9D. 163.(希望杯)当b=1时,关于x 的方程a(3x-2)+b(2x-3)=8x-7有无数多个解,则a 等于( )A .2B .-2C .-32 D .不存在 4.(希望杯)已知关于x 的一次方程(3a+8b )x+7=0无解,则ab 是( )A .正数B .非正数C .负数D .非负数5.(2014年竞赛题)植树节时,某班平时每人植树6棵,如果只由女生完成,每人应植树15棵,如果只由男生完成,每人应植树( )棵。

A .9B .10C .12D .14二、填空题1.(希望杯)若关于x 的方程(k+m )x+4=0和(2k-m )x-1=0的解相同,则mk -2的值是 。

2.(希望杯)已知关于x 的方程9x-3=kx+14有整数解,那么满足条件的所有整数k =.3.(希望杯)若(3a+2b)x 2+ax+b=0是关于x 的一元一次方程,且有唯一解,则x =.4.(希望杯)方程x 2+ x 6+ x 12+…+ x 2008×2009=2008的解是x =. 5.(希望杯)如果 a +1 20= b +1 21= a +b 17,那么 a b=. 三、解答题1. 整理一批图书,由一个人做要50小时完成.现计划先安排一部分人先做5小时,再增加2人和他们一起做7小时完成这项工作,假设这些人的工作效率相同,按计划应先安排多少人先工作5小时?2.如图,8块相同的长方形地砖拼成一个长方形,每块长方形地砖的长和宽分别是多少?3.已知x、y为有理数,现规定一种新运算“※”,满足x※y=xy+1.(1)求3※4的值;(2)若(2※ m)※(-4)=21,求m的值(3)探索a※(b﹣c)与(a※b)﹣(a※c)的关系,并用等式表示它们.4.在手工制作课上,老师组织七年级(2)班的学生用硬纸制作圆柱形茶叶筒.七年级(2)班共有学生44人,其中男生人数比女生人数少2人,并且每名学生每小时剪筒身50个或剪筒底120个.(1)七年级(2)班有男生、女生各多少人?(2)要求一个筒身配两个筒底,为了使每小时剪出的筒身与筒底刚好配套,应该分配多少名学生剪筒身,多少名学生剪筒底?5.某市居民用电电费目前实行梯度价格表(为计算方便,数据进行了处理)0.60.8(1)若月用电150千瓦时,应交电费元,若月用电250千瓦时,应交电费元.(2)若居民王成家12月应交电费150元,请计算他们家12月的用电量.(3)若居民王成家12月份交纳的电费,经过测算,平均每千瓦时0.55元.请计算他们家12月的用电量.6.甲乙两地相距900千米,一列快车从甲地出发匀速开往乙地,速度为120千米/时;快车开出30分钟时,一列慢车从乙地出发匀速开往甲地,速度为90千米/时.设慢车行驶时间为x小时,快车到达乙地后停止行驶,根据题意解答下列问题:(1)当快车与慢车相遇时,求慢车行驶的时间;(2)当两车之间的距离为315千米时,求快车所行的路程;7. 我们规定,若关于x的一元一次方程ax=b的解为b﹣a,则称该方程为“差解方程”,例如:2x=4的解为2,且2=4﹣2,则该方程2x=4是差解方程.请根据上边规定解答下列问题:(1)判断3x=4.5是否是差解方程;(2)若关于x的一元一次方程6x=m+2是差解方程,求m的值.8.(2016年厦门期末) 已知甲组数据:1,2,3,4,5,6,7,8,9,10,11,12;乙组数据:a1,a2,a3,…,an(a1,a2,a3,…,an分别是甲组数据中某个数的相反数,且它们各不相同).若a1+a2+a3+…+an=-39,则称乙组数据是关于甲组数据的一个“零和数”.(1) 判断-1,-4,-5,-7,-10,-12这组数据是否是关于甲组数据的一个“零和数”,并说明理由;(2)若丙组数据: b1,b 2,b 3,…,b m是关于甲组数据的一个“零和数”,则m的最大值及最小值分别是多少,并说明理由.。

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1. Michael Jordan is a basketball star. I like ________ very much.
A. he
B. his
C. him
D. himself
2. There are ________ days in a week.
A. the seven
B. seventh
C. the seventh
D. seven
3. "What's the ________ today?" "It's June 26."
A. day
B. date
C. time
D. hour
4. "Does Wang Li ________ English well?" "Sure. She studied it for two years in America."
A. speak
B. talk
C. say
D. tell
5. Jenny and her parents ________ going to visit the palace Museum tomorrow.
A. is
B. am
C. are
D. be
6. Beijing has ________ many buses that there is often a traffic jam in rush hours.
A. so
B. very
C. too
D. much
So that为固定搭配
7. Look! The boys ________ happily in the river.
A. swim
B. swam
C. will swim
D. are swimming
8. Linda often helps her mother ________ the housework on weekends.
A. with
B. to
C. of
D. for
9. E-mailing is much ________ the long-distance calling.
A. cheap
B. cheaper
C. cheapest
D. the cheapest
10. I will let you know about it as soon as I ________ the news.
A. will get
B. gets
C. got
D. get
11. China ________ the WTO and became a new member of it last year.
A. joined
B. join
C. will join
D. has joined
12. ________ you pass me a pen? I'd like to write down the telephone number.
A. Need
B. Could
C. Must
D. Should
13. —Why didn't Nick come to school yesterday?
—________ he was ill.
A. After
B. Where
C. When
D. Because
14. ________ the evening of May 31, the 2002 FIFA World Cup started in South Korea.
A. On
B. At
C. Of
D. In
15. —Do you know ________? I'm going to see him.
—Sorry, I don't know.
A. where does Mr. Li live
B. where did Mr. Li live
C. where Mr. Li lives
D. where Mr. Li lived
16. The text is very easy for you. There are ________ new words in it.
A. a few
B. a little
C. few
D. little
17. The earth is our home. We must ________ the land, air and water clean.
A. change
B. share
C. notice
D. keep
Keep+adj,A/B/C不能直接加形容词
18. —Can I get you a drink?
—That's very nice of you. I've already got ________.
A. it
B. one
C. that
D. this。

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