25 道化简求值的题目._________谢.

xiaogaolegao2022-10-04 11:39:541条回答

25 道化简求值的题目._________谢.
急需 .谢谢 .

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雁落粉荷共回答了24个问题 | 采纳率95.8%: 3．3ab-4ab+8ab-7ab+ab=______．
4．7x-(5x-5y)-y=______．
5．23a3bc2-15ab2c+8abc-24a3bc2-8abc=______．
6．-7x2+6x+13x2-4x-5x2=______．
7．2y+(-2y+5)-(3y+2)＝______．
11．(2x2-3xy+4y2)+(x2+2xy-3y2)=______．
12．2a-(3a-2b+2)+(3a-4b-1)=______．
13．-6x2-7x2+15x2-2x2＝______．
14．2x-(x+3y)-(-x-y)-(x-y)＝______．
16．2x+2y-[3x-2(x-y)]=______．
17．5-(1-x)-1-(x-1)=______．
18．( )+(4xy+7x2-y2)=10x2-xy．
19．(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3．
21．已知A=x3-2x2+x-4,B=2x3-5x+3,计算A+B=______．
22．已知A=x3-2x2+x-4,B=2x3-5x+3,计算A-B=______．
23．若a=-0.2,b=0.5,代数式-(|a2b|-|ab2|)的值为______．
25．一个多项式减去3m4-m3-2m+5得-2m4-3m3-2m2-1,那么这个多项式等于______．
26．-(2x2-y2)-[2y2-(x2+2xy)]=______．
27．若-3a3b2与5ax-1by+2是同类项,则x=______,y=______．
28．(-y+6+3y4-y3)-(2y2-3y3+y4-7)＝______．
29．化简代数式4x2-[7x2-5x-3(1-2x+x2)]的结果是______．
30．2a-b2+c-d3=2a+( )-d3=2a-d3-( )=c-( )．
31．3a-(2a-3b)+3(a-2b)-b=______．
32．化简代数式x-[y-2x-(x+y)]等于______．
33．[5a2+( )a-7]+[( )a2-4a+( )]=a2+2a+1．
34．3x-[y-(2x+y)]=______．
35．化简|1-x+y|-|x-y|(其中x＜0,y＞0)等于______．
36．已知x≤y,x+y-|x-y|=______．
37．已知x＜0,y＜0,化简|x+y|-|5-x-y|=______．
38．4a2n-an-(3an-2a2n)＝______．
39．若一个多项式加上-3x2y+2x2-3xy-4得
2x2y+3xy2-x2+2xy,
则这个多项式为______．
40．-5xm-xm-(-7xm)+(-3xm)=______．
41．当a=-1,b=-2时,
[a-(b-c)]-[-b-(-c-a)]＝______．
43．当a=-1,b=1,c=-1时,
-[b-2(-5a)]-(-3b+5c)＝______．
44．-2(3x+z)-(-6x)+(-5y+3z)=______．
45．-5an-an+1-(-7an+1)+(-3an)＝______．
46．3a-(2a-4b-6c)+3(-2c+2b)=______．
48．9a2+[7a2-2a-(-a2+3a)]=______．
50．当2y-x=5时,5(x-2y)2-3(-x+2y)-100=______．; 1年前

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A.Take B.Taking C.Takes D.Took

What time does Jane _____ after school?	[ ]
A.do her homework B.does her homework C.do her homeworks D.does her homeworks

— Where is Sue,do you know? — She ______ the classroom with her classmates.	[ ]
A.cleans B.was cleaning C.is cleaning D.cleaned

曾一度被誉为“东欧消费者的天堂”的匈牙利也发生了***剧变,我们从东欧剧变中得到的启示是	[ ]
a．根据本国*建设主义 b．一定要优先发展重工业 c．要建立高度集中的*** d．必须坚持计划经济*

Jenny likes __________ in the wind.	[ ]
A. plays B.played C.to play

What _____________ you do last weekend?	[ ]
A.does B.do C.did

I asked Lily for paper,but she didn’t have .	[ ]
A.any; some B.any; any C.some; any D.some; some

________ pears do you have?Three.	[ ]
A.What many B.How many

The bike hit the tree _____ I could get off.	[ ]
A. as B. before C. until D. while

Mr. Black is a doctor. He works _____.	[ ]
A. in hospital B. on hospital C. in a hospital D. on a hospital

It’s brave _______ you to go ________ the forest.	[ ]
A.for,across B.of ,across C.for,through D.of,through

—Do you think it will rain tomorrow? —_____.It has been so dry for weeks.	[ ]
A.I hope so B.I'm afraid so C.I'd like so D.Of course not

—Let's go to buy some presents for Millie.Because tomorrow is her birthday. —Now?It's 11 p.m.I'm afraid the shop is ______.	[ ]
A.closed B.opened C.close D.open

Those boys didn't start the work _____ their teacher come back.	[ ]
A.until B.while C.as soon as D.if

There are many differences between American English and British English in spelling and pronunciation, especially in _____ English.	[ ]
A.written B.oral C.official D.business

Jane is the only one of the girls who ______ playing football in her class.	[ ]
A.are enjoying B.enjoys C.enjoy D.is enjoyed

-Dad,there is a snake at the gate crawling this way. -Don't __________,boys；there's no danger.	[ ]
A．afraid B．frighten C．terrify D．panic

You _____ park here!It's an emergency exit.	[ ]
A.wouldn't B.needn't C.couldn't D.mustn't

—What's ________ the library? —There are many books.	[ ]
A. on B. in C. at

25 道 化 简 求 值 的 题 目._________谢.

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25 道化简求值的题目._________谢.

This apple is ______ than that one.	[ ]
A.big B.biger C.bigger D.the bigger

Lucy is one of_____ in our school.	[ ]
A the beautiful girl B the beautiful girls C the most beautiful girl D the most beautiful girls

If I can run as _______ as Tom,both of us will be chosen to take part in the sports meeting.	[ ]
A.fast B.faster C.fastest D.the fastest

Jim has ______ books than Tom.	[ ]
A.fewer B.few C.less D.little

Li Ming works ____________ in school.	[ ]
A.hardly B.hard C.easy D.easily

— Will you give this message to Mr.White,please? — Sorry,I can't.He ____.	[ ]
A.doesn't any more work here B.doesn't any longer work here C.doesn't work any more here D.doesn't work here any longer

— Hello!This is John. — ____________________	[ ]
A.Hi!I'm Mike. B.Nice to meet you.