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此题，求详解
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路线就是半径为2的半圆的周长，半径是不是都是2，绕A点和绕C点，你看，同理，是半径为3的半圆周长，这样，并且2个曲线合在一起，B点和D点，是不是一个半径为2的半圆简单呀
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出门在外也不愁先阅读以下材料，然后解答问题：材料：将二次函数y=-x2+2x+3的图象向左平移1个单位，再向下平移2个单位，求平移后的抛物线的解析式（平移后抛物线的形状不变）．解：在抛物线y=-x2+2x+3图象上任取两点A（0，3）、B（1，4），由题意知：点A向左平移1个单位得到A′（-1，3），再向下平移2个单位得到A″（-1，1）；点B向左平移1个单位得到B′（0，4），再向下平移2个单位得到B″（0，2）．设平移后的抛物线的解析式为y=-x2+bx+c．则点A″（-1，1），B″（0，2）在抛物线上．可得：方程组{-1-b+c=1,c=2} ，解得：方程组{b=0,c=2} ．所以平移后的抛物线的解析式为：y=-x2+2．根据以上信息解答下列问题：将直线y=2x-3向右平移3个单位，再向上平移1个单位，求平移后的直线的解析式．-乐乐题库
& 二次函数图象与几何变换知识点 & “先阅读以下材料，然后解答问题：材料：将二...”习题详情
160位同学学习过此题，做题成功率67.5%
先阅读以下材料，然后解答问题：材料：将二次函数y=-x2+2x+3的图象向左平移1个单位，再向下平移2个单位，求平移后的抛物线的解析式（平移后抛物线的形状不变）．解：在抛物线y=-x2+2x+3图象上任取两点A（0，3）、B（1，4），由题意知：点A向左平移1个单位得到A′（-1，3），再向下平移2个单位得到A″（-1，1）；点B向左平移1个单位得到B′（0，4），再向下平移2个单位得到B″（0，2）．设平移后的抛物线的解析式为y=-x2+bx+c．则点A″（-1，1），B″（0，2）在抛物线上．可得：{-1-b+c=1c=2，解得：{b=0c=2．所以平移后的抛物线的解析式为：y=-x2+2．根据以上信息解答下列问题：将直线y=2x-3向右平移3个单位，再向上平移1个单位，求平移后的直线的解析式．
本题难度：一般
题型：解答题&|&来源：2013-凉山州
分析与解答
习题“先阅读以下材料，然后解答问题：材料：将二次函数y=-x2+2x+3的图象向左平移1个单位，再向下平移2个单位，求平移后的抛物线的解析式（平移后抛物线的形状不变）．解：在抛物线y=-x2+2x+3图象上任取两点A...”的分析与解答如下所示：
根据上面例题可在直线y=2x-3上任取一点A（0，-3），由题意算出A向右平移3个单位，再向上平移1个单位得到A′点坐标，再设平移后的解析式为y=2x+b，再把A′点坐标代入解析式即可．
解：在直线y=2x-3上任取一点A（0，-3），由题意知A向右平移3个单位，再向上平移1个单位得到A′（3，-2），设平移后的解析式为y=2x+b，则A′（3，-2）在y=2x+b的解析式上，-2=2×3+b，解得：b=-8，所以平移后的直线的解析式为y=2x-8．
此题主要考查了一次函数图象的几何变换，关键是掌握一次函数图象平移后k值不变．
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先阅读以下材料，然后解答问题：材料：将二次函数y=-x2+2x+3的图象向左平移1个单位，再向下平移2个单位，求平移后的抛物线的解析式（平移后抛物线的形状不变）．解：在抛物线y=-x2+2x+3图象上...
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经过分析，习题“先阅读以下材料，然后解答问题：材料：将二次函数y=-x2+2x+3的图象向左平移1个单位，再向下平移2个单位，求平移后的抛物线的解析式（平移后抛物线的形状不变）．解：在抛物线y=-x2+2x+3图象上任取两点A...”主要考察你对“二次函数图象与几何变换”
等考点的理解。
因为篇幅有限，只列出部分考点，详细请访问。
二次函数图象与几何变换
由于抛物线平移后的形状不变，故a不变，所以求平移后的抛物线解析式通常可利用两种方法：一是求出原抛物线上任意两点平移后的坐标，利用待定系数法求出解析式；二是只考虑平移后的顶点坐标，即可求出解析式．
与“先阅读以下材料，然后解答问题：材料：将二次函数y=-x2+2x+3的图象向左平移1个单位，再向下平移2个单位，求平移后的抛物线的解析式（平移后抛物线的形状不变）．解：在抛物线y=-x2+2x+3图象上任取两点A...”相似的题目：
与抛物线y=-2x2关于x轴对称的抛物线解析式为&&&&．
二次函数y=x2的图象向上平移2个单位，得到新的图象的二次函数表达式是&&&&y=x2-2y=（x-2）2y=x2+2y=（x+2）2
将抛物线y=3x2的图象先向上平移3个单位，再向右平移4个单位所得的解析式为&&&&y=3（x-3）2+4y=3（x+4）2-3y=3（x-4）2+3y=3（x-4）2-3
“先阅读以下材料，然后解答问题：材料：将二...”的最新评论
该知识点好题
1已知二次函数y=3x2-6x+5，若它的顶点不动，把开口反向，再沿对称轴平移，得一条新抛物线，它恰好与直线y=-x-2交于点（a，-4），则新抛物线的解析式为（　　）
2已知二次函数y=ax2+bx+c（a≠0）的图象如图所示，给出以下结论：①a、b同号；②要使该抛物线平移后过原点，则至少需平移1个单位；③该抛物线关于直线x=-2对称；④当y=-1时，x的值只能取0；⑤关于x的一元二次方程ax2+bx+c=0的正根在0与1之间．其中正确结论的个数是（　　）
3抛物线y=x2+4x+1可以由抛物线y=x2平移得到，则下列平移过程正确的是（　　）
该知识点易错题
1由函数y=-12x2的图象平移得到函数y=-12（x-4）2+5的图象，则这个平移是（　　）
2如图，平面直角坐标系中有一张透明纸片，透明纸片上有抛物线y=x2及一点P（2，4）．若将此透明纸片向右、向上移动后，得抛物线的顶点为（7，2），则此时点P的坐标是（　　）
3将抛物线y=12x2的图象向上平移3个单位，则平移后的抛物线C1的解析式为&&&&，再将C1以原点为中心，旋转180度所得抛物线C2的解析式为&&&&．
欢迎来到乐乐题库，查看习题“先阅读以下材料，然后解答问题：材料：将二次函数y=-x2+2x+3的图象向左平移1个单位，再向下平移2个单位，求平移后的抛物线的解析式（平移后抛物线的形状不变）．解：在抛物线y=-x2+2x+3图象上任取两点A（0，3）、B（1，4），由题意知：点A向左平移1个单位得到A′（-1，3），再向下平移2个单位得到A″（-1，1）；点B向左平移1个单位得到B′（0，4），再向下平移2个单位得到B″（0，2）．设平移后的抛物线的解析式为y=-x2+bx+c．则点A″（-1，1），B″（0，2）在抛物线上．可得：方程组{-1-b+c=1,c=2} ，解得：方程组{b=0,c=2} ．所以平移后的抛物线的解析式为：y=-x2+2．根据以上信息解答下列问题：将直线y=2x-3向右平移3个单位，再向上平移1个单位，求平移后的直线的解析式．”的答案、考点梳理，并查找与习题“先阅读以下材料，然后解答问题：材料：将二次函数y=-x2+2x+3的图象向左平移1个单位，再向下平移2个单位，求平移后的抛物线的解析式（平移后抛物线的形状不变）．解：在抛物线y=-x2+2x+3图象上任取两点A（0，3）、B（1，4），由题意知：点A向左平移1个单位得到A′（-1，3），再向下平移2个单位得到A″（-1，1）；点B向左平移1个单位得到B′（0，4），再向下平移2个单位得到B″（0，2）．设平移后的抛物线的解析式为y=-x2+bx+c．则点A″（-1，1），B″（0，2）在抛物线上．可得：方程组{-1-b+c=1,c=2} ，解得：方程组{b=0,c=2} ．所以平移后的抛物线的解析式为：y=-x2+2．根据以上信息解答下列问题：将直线y=2x-3向右平移3个单位，再向上平移1个单位，求平移后的直线的解析式．”相似的习题。谁能给我一些被动语态的练习题求被动语态的练习题,要有一般现在时、一般进行时、现在进行时、一般将来时、现在完成时几种形式的练习题.而且需要答案和解析（一定要解析啊,没解析的_作业帮
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谁能给我一些被动语态的练习题求被动语态的练习题,要有一般现在时、一般进行时、现在进行时、一般将来时、现在完成时几种形式的练习题.而且需要答案和解析（一定要解析啊,没解析的
谁能给我一些被动语态的练习题求被动语态的练习题,要有一般现在时、一般进行时、现在进行时、一般将来时、现在完成时几种形式的练习题.而且需要答案和解析（一定要解析啊,没解析的不要）!谢谢啦
1( ) 1 The People's Republic of China ___ on October 1, 1949.A. found B. was founded C. is founded D. was found( ) 2 English ____ in Canada.A. speaks B. are spoken C. is speaking D. is spoken( )3 This English song___ by the girls after class.A. often sings B. often sangC. is often sang D. is often sung( ) 4 This kind of car ___ in Japan.A, makes B. made C. is making D. is made( ) 5 New computers ___ all over the world.A. is used B. are using C. are used D. have used2( ) 1 Our room must ___ clean.A. keep B. be kept C. to be kept D. to keep( ) 2 -I'd like to buy that coat.-I'm sorry. ___.A. it sold B. it's selling C. It's been sold D. it had been sold( ) 3 A new house ___ at the corner of the road.A. is building B. is being built C. been built D. be building( ) 4 The key ___ on the table when I leave.A. was left B. will be left C. is left D. has been left( ) 5 Doctors ___ in every part of the world.A. need B. are needing C. are needed D. will need( ) 6 His new book___ next month.A. will be published B. is publishing C. is being published D. has been published3( ) 1 Japanese ___ in every country.A. is not spoken B. are spoken C. is speaking D. is not speaking( ) 2 These papers___yet.A. have not written B. have not been written C. has not written D. has not been written( ) 3 The sports meet ___ be held until next week.A. didn't B. won't C. isn't D. doesn't4( ) 1 -My shoes are worn out. A. Can't they be mended? B. Let me have a look at it.C. How much do they cost? D. Can't they mended?( ) 2 ___ the watch been repaired yet? I badly need it.A. Does B. Has C. Is D. Are( ) 3 ___ these desks be needed?A. Will B. Are C. Has D. Do5( ) 1 Why ___ to talk about it yesterday?A. didn't a meeting hold B. wasn't a meeting held C. wasn't held a meeting D. a meeting wasn't held( ) 2 Who was the book___?A. write B. wrote C. written D. written by( ) 3 Where ___ these boxes made?A. was B. were C. is D. am6( ) 1 The flowers___often.A. must be water B. must be watered C. must watered D. must water( ) 2 The books may___ for two weeks.A. be kept B. be borrowed C. keep D. borrow( ) 3 The broken bike____ here by Mr Smith.A. can mend B. can mended C. can be mend D. can be mended7( ) 1 The old bridge in my hometown___ next month.A. is going to be rebuilt B. will rebuilt C. are going to be rebuiltD. are going to rebuilt( ) 2 The play ___ at the theatre next Sunday.A. is going to be shown B. will shownC. will show D. is shown( ) 3 The old stone bridge ___ next week.A. is going to be rebuilt B. will be rebuild C. are going to be rebuilt D. will rebuild8( ) 1 Now these magazines___ in the library for a long time. A. have kept B. are keeping C. have been keeping D. have been kept( ) 2 The pot ___ for ___ hot water.A. keeping B. keeping C. to keep D. keep( ) 3 Tea ___ in the south of China.A. grows B. is grown C. were grown D. will grow( ) 4 The bridges___ two years ago.WO It's a Haidian top problemoA. is built B. built C. were built D. was built( ) 5 Wet clothes are often ___ up near a fire in rainy weather.A. hang B. hanged C. hanging D. hung9( ) 1 The river smells terrible. People must ___ dirty things into it.A. be stopped to throw B. be stopped from throwingC. stop to throw D. stop from throwing( ) 2 The teapot ___ water.A. is filled with B. filled ofC. fulling of D. filled( ) 3 Old people must be looked ^fter well and ___ politely.A. speak to B. spoken C. speak D. spoken to( ) 4 Old people must ___.A. look after well B. be looked well after C. looked well after D. be looked after well10( ) 1 Newly-born babies___in hospital.A. are taken good care B. are taken good care of C. take good care of D. take good care( ) 2 They were___ at the sudden noise.A. frightening B. frightened C. frighten D. frightens( ) 3 These walls___stone.A. are made of B. made of u C. are made into D. made into11( ) 1 Jane ___ to sing us an American song last Saturday.A. called B. was asked C. told D. was said( ) 2 The papers ___ to them.A. were shown B. show C. shown / D. have shown( ) 3 The coat___her sister.A. made to B. were made for C. was made for D. was made to12( ) 1 I ___ five minutes to decide whether I should go or not.A. gave B. was giving C. had given D. was given( ) 2 Good care____such things.A. should take of B. should be taken C. should be taking D. should be taken of( ) 3 She will____good care____.A. of B. of C. for you D. of you13( ) 1 The teacher made him___ his homework.A. to do B. do C. did D. done( ) 2 The boy___ streets without pay in the old days.A. was made to clean B. made cleanC. made to clean D. was made clean( ) 3 These children____dance.A. were seen to B. were seen for C. were seen D. saw to14( ) 1 These stones___well.
A. are fitted B. fit C. fits D. is fitted( ) 2 The bike ___ 500 yuan. A. was cost B. costed C. cost D. is costed( ) 3 The important meeting ___ on a cold morning last year.A. was'had B. was held C. held D. had15( ) 1 Great changes___ in the past ten years in China.A. took place B. have taken place C. were taking place D. had taken place( ) 2 You can't use the computer, it____.A. was broken down B. is wrong C. is bad D. has broken down( ) 3 Great changes___in our country during the past 20 years. A. have happened B. happened C. have been happened D. were happened( ) 4 The watch has often ___ down.A. sat B. lain C. broken D. fell16( ) 1 Please pass me another cup. This one___.A. is broken B. is breaking C. broke D. broken( ) 2 The story books___ by the writer in the 1960s.A. are written B. were written C. are writing D. were writing( ) 3 What time ___ the door ___ every day?A. closed B. close C. closed D. /; close17( ) 1 Can he___himself? A. get dress B. get dressed C. gets dressed D. instead of( ) 2 He fell from his bike and ___.A. is hurt B. gets hurt C. got hurt D. hurt( ) 3 Lookout, please keep away from the fire, or your trousers will__A. burnt B. burn C. burning D. get burn18( ) 1 The apple___very sweet.A. is tasted B. taste -C. tastes D. are tasting( ) 2 You___ more beautiful in the light blue shirt.A. see B. watch C. look D. look at( ) 3 What you said ___. like a good idea.A. heard B. listened C. sound D. sounded19( ) 1 -What do you think of the TV play?-Wonderful. It is worth___ a second time.A. watching B. watched C. seen D. seeing( ) 2 How dirty the tables are! They need___.A. to clean B. clean C. cleaning D. cleaned( ) 3 The book is worth ___.A. seeing B. reading C. seen D. read参考答案：1. 1-5 B D D D C 　　　　　　2. 1-6 B C B B C A 　　　　　　3. 1-3 A B B 　　　　　　　4. 1-3 A B A 　　　　　　　　5. 1-3 B D B6. 1-3 B A D7. 1-3 A B A8. 1-5 D B B C D9. 1-4 B A D D10. 1-3 B B A11. 1-3 B A C12. 1-3 D D B13. 1-3 B A A14. 1-4 B C B 15. 1-4 B D A C16. 1-3 A B C17. 1-3 B C D18. 1-3 C C D19. 1-3 A C B
(转载英语被动语态练习题附答案 1._____ a new library _____ in our school last year? "Aj%\7a 
A. Is，built B. Was , built
C. D build D . D build 2.An accident ____ on this road last w...高中定语从句练习题急求详解 （求专业解答,半桶水勿入）Susan is not the brilliant writer _____ she used to be.A.which B.that C.who D.whomThey stayed with me for three weeks,_____ they drank all the wine I had.A.which B.which tim_作业帮
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高中定语从句练习题急求详解 （求专业解答,半桶水勿入）Susan is not the brilliant writer _____ she used to be.A.which B.that C.who D.whomThey stayed with me for three weeks,_____ they drank all the wine I had.A.which B.which tim
高中定语从句练习题急求详解 （求专业解答,半桶水勿入）Susan is not the brilliant writer _____ she used to be.A.which B.that C.who D.whomThey stayed with me for three weeks,_____ they drank all the wine I had.A.which B.which time C.during which D.during which time It is the one of the best films_____.A.which have been made in China B.that has ever been made in ChinaC.that have ever been made in China D.which has been made in ChinaThe old man finally got a chance to visit the school,_____ he used to study,_____ he had been dreaming of for years.A.that… which B.where… that C.in which…what D.where…which_____ all that _____ to be done been done?A.Have...have B.Have…has C.Has…has D.Has…have--Why am I so slow at doing the cloze test?--I guess you didn't realize the use ______ the contexts.A.you should have made of B.you must have made fromC.from which you could have made D.out of which you need makeDon’t leave the knife _____.Which is wrong?A.in a place where children can get it B.where children can get itC.in a place which is within children’s reach D.in which children can get it I’m looking for a present for my mother’s birthday,_____ she can use and at a reasonable price.A.that B.one C.what D.whichThe curious child didn’t believe the fact _____.A.that most of them thought it to be true B.most of them thought to be trueC.what most of them thought was true D.as most of them thought trueNothing but a few pictures _____ given to Tom,_____ he was fond of.A.was…which B.were…which C.was…that D.were…thatThe conclusion _____ the police came to _____ he was innocent didn’t satisfy everybody.A.that…which B./…that C.which…which D.that…/Among all the contestants,only Mary _____ had supposed could win the first prize.A.who B./ C.I D.thatTo save money for my education,my mother often takes on more work _____ good for her.A.than what is B.than that is C.than it is D.than isI feel disappointed as the new house isn’t quite _____ it should be.A.as B.that C.what D.whichThe scientists and technicians overcame a lot of difficulty _____ the personal computer.A.they had developing B.having developing C.they had developed D.that had to develop 答案是BDBDC ADBBA BCDCA并且帮我仔细分析一下为什么不能选ACCBA CBDAB ADAAD
1B.当先行词为主句的表语,或者关系代词为从句的表语的时候,那么只能选that.这是13种只能用that的情况中的一种.2D他们和我在一起三个星期了,在那段时间里,他们喝光了我所有的酒.先行词后面的关系词在从句中是作为状语的,所以首先排除A,which作为状语,就只能在其前面加一个介词,这是因为介词+which=关系副词,故而排除B,而在非限制性定语从句中表示时间状语的,就只能用during which time.3B这是目前为止中国拍得最好的一部片子了.定语从句中如果先行词被最高级修饰,那么关系代词一定是that,因此排除A,D.中心词虽然是the best films,但前面还有一个one,同时it后面的is 也很好地暗示了从句中谓语动词只能用单数,所以选B4D,这个老人最终有机会访问他曾经就读过的学校,他梦想回到母校已多年了.Study是一个不及物动词,因此后面没有必要加宾语,因此排除A,后半句是一个非限制性定语从句,其中dream of的of 缺少一个宾语,所以得选一个关系代词,故而排除B,这里是定语从句,而不是主语从句所以排除C,which指代的是got a chance to visit the school这件事,因而选which5C那些必须去做的事做完了吗?all指人时,动词用复数;all指物时,动词用单数所以这两个空,都选择has,排除A,B,D6A 为啥我做填空如此之慢?我猜你没有意识到去运用（make the use of ）上下文.从 didn’t可以确定,前面说到的那个人没有利用,should have done 本应该而没有,正好与原题题意相符,因此选A7D,不要把刀放在孩子容易够得着的地方,介词+which结构中的介词往往是根据定语从句中谓语动词的固定搭配来决定的.而 get in的意思是1.进入,参加；收（获）,收回；插入（放） 2.收获；收(税等)；抵达 3.进入, 收获,达到.
Get in 虽然有达到的意思,但是get in 中的in后面的which应该是指代地点,而前面没有表示地点的先行词place,只有一个knife,也就是说D是缺少了一个先行词.如果D换成in a place in which children can get it则可以8Bpresent和后半句之间有逗号隔开,但后半句不是非限制性定语从句.如果是的话,那么后半句应该是____she can use and is at a reasonable price.
如果没有了is 的话,那么and 后面的at a reasonable price就不能和空格中的关系词构成一个完整句了.所以关系词one是一个同位语.后面一半是同位语从句,而另一半是介词短语作为同位语one的后置定语.9B 这道题的陷阱就是考生对于见到the fact that时 的定势思维.如果这是一个the fact that引导的同位语从句,那么that后面应该是对fact的具体阐释,如the fact that地球围绕太阳转.但选项中most of them thought it to be true不是对fact的具体阐释,而是人们对fact 的看法,这就是这道题的玄机所在.因此这是一个宾语从句,the
fact也是作为thought的宾语,因此关系代词that可以省略,还原之后就是The curious child didn’t believe the fact （that） most of them thought to be true10A当主语后面跟有with, together with, like, except, but, no less than, as well as 等词引起的短语时,谓语动词与前面的主语一致.因此第一个空用单数,后半句是一个非限制性定语从句,fond of 后面少了一个宾语,而非限制性定语从句中which正好可以充当宾语,因此选A11B警察得出他无罪的结论不能让众人满足.你要注意：“警察得出的结论”中的“的”说明The conclusion _____ the police came to 是一个定语从句,The conclusion_____ he was innocent.才是一个同位语从句.因此第一个空选that或者which都无所谓,第二个空必然为that.从这题可以看出,命题人的一大乐趣就是在一个从句里面安插其他干扰性成分,然考生出错,这题和第九题还是很相似的考法.所以,考生须学会怎样根据句子的结构来简化句子,找到解题的思路.12C在所有的参赛者当中,（人们）认为只有Mary可以获得第一名. Among all the contestants, only Mary could win the first prize.是主句.Suppose的所有用法中,只有be supposed to be 与题目的意思相吻合,所以had supposed是一个过去分词作为后置定语,而不是从句.13这题感觉是选A,这个句子考查了more than 的比较结构,其中than是一个连词,所以其语法属性相当于and.所以分析这个句子的语法结构的时候,more than是不造成语法干扰的,你可以把more than拿掉,原句就变为To save money for my education, my mother often takes on work __what
is ___ good for her.14C 如果把空格后面的句子it should be 遮住,你会发现前面 isn’t quite后面缺少表语,而后面be动词后面也是缺少了一个表语,所以后半句是一个表语从句,表语从句中that是连词,不充当句子成分,what除了充当引导词还在从句中长当成分,所以选what15A在研发个人电脑的时候,科学家和技师们克服了许多困难.Difficulty很明显是一个定语从句,如果在had 和developing之间加一个逗号,你会发现,原来developing the personal computer是非谓语形式做伴随状语的.题干的中文还可以这样翻译： Developing the personal computer,the scientists and technicians overcame a lot of difficulty they had .这句话和题干的意思是不是一模一样?只不过这句话的伴随状语Developing the personal computer放到了前面,而题干是将之放到了后面!只是语序变了一下就形成了难度.这是一道技巧性很强的题目,值得细细品味.