求20道初一整式的化简求值计算题 求20道初一上学期整式化简求值的题
\u6c4220\u9053\u521d\u4e00\u4e0a\u5b66\u671f\u6574\u5f0f\u5316\u7b80\u6c42\u503c\u7684\u9898\uff01\uff01\uff011\uff0e2X\u2015[6-2(X-2)] \u5176\u4e2d X=-2
2\uff0e(5a\uff0b2a2\uff0d3\uff0d4a3)\uff0d(\uff0da\uff0b3a3\uff0da2)\uff0c\u5176\u4e2da\uff1d\uff0d2
3\uff0e(2m2n\uff0b2mn2)\uff0d[2(m2n\uff0d1)\uff0b2mn2\uff0b2]\uff0c\u5176\u4e2dm\uff1d\uff0d2\uff0cn\uff1d2
4\uff0e(5a\uff0b2a2\uff0d3\uff0d4a3)\uff0d(\uff0da\uff0b3a3\uff0da2)\uff0c\u5176\u4e2da\uff1d\uff0d2
5\u3001(2m2n\uff0b2mn2)\uff0d[2(m2n\uff0d1)\uff0b2mn2\uff0b2]\uff0c\u5176\u4e2dm\uff1d\uff0d2\uff0cn\uff1d2
6\uff0e3(ab\uff0bbc)\uff0d3(ab\uff0dac)\uff0d4ac\uff0d3bc \u5176\u4e2d\uff1aa\uff1d2001/2002\uff0cb\uff1d1/3\uff0cc\uff1d1
7\uff0e\uff083xy\uff0b10y\uff09\uff0b[5x\uff0d(2xy\uff0b2y\uff0d3x)]\u5176\u4e2dxy\uff1d2\uff0cx\uff0by\uff1d3
8\uff0e\u5df2\u77e5a\uff1d\uff0d2\uff0cb\uff1d\uff0d1\uff0cc\uff1d3\uff0c\u6c42\u4ee3\u6570\u5f0f5abc\uff0d2a2b\uff0b[3abc\uff0d\uff084ab2\uff0da2b\uff09]\u7684\u503c\u3002
9\uff0e 2 ( a2b + ab2)- [ 2ab2 - (1- a2b) ] - 2\uff0c\u5176\u4e2da= -2\uff0cb=0\uff0e5
10.\uff08\uff0d3x2\uff0d4y\uff09\uff0d\uff082x2-5y+6\uff09+(x2-5y-1) \u5176\u4e2d x=-3 ,y=-1
10\u9053\u591f\u5417\uff0c\u5b9e\u5728\u6ca1\u6709\u529b\u6c14\u627e\u5566~
1.3ab-4ab+8ab-7ab+ab=______.
2.7x-(5x-5y)-y=______.
3.23a3bc2-15ab2c+8abc-24a3bc2-8abc=______.
4.-7x2+6x+13x2-4x-5x2=______.
5.2y+(-2y+5)-(3y+2)=______.
6.(2x2-3xy+4y2)+(x2+2xy-3y2)=______.
7.2a-(3a-2b+2)+(3a-4b-1)=______.
8.-6x2-7x2+15x2-2x2=______.
9.2x-(x+3y)-(-x-y)-(x-y)=______.
10.2x+2y-[3x-2(x-y)]=______.
11.5-(1-x)-1-(x-1)=______.
12.( )+(4xy+7x2-y2)=10x2-xy.
13.(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3.
14.\u5df2\u77e5A=x3-2x2+x-4,B=2x3-5x+3,\u8ba1\u7b97A+B=______.
15.\u5df2\u77e5A=x3-2x2+x-4,B=2x3-5x+3,\u8ba1\u7b97A-B=______.
16.\u82e5a=-0.2,b=0.5,\u4ee3\u6570\u5f0f-(|a2b|-|ab2|)\u7684\u503c\u4e3a______.
17.\u4e00\u4e2a\u591a\u9879\u5f0f\u51cf\u53bb3m4-m3-2m+5\u5f97-2m4-3m3-2m2-1,\u90a3\u4e48\u8fd9\u4e2a\u591a\u9879\u5f0f\u7b49\u4e8e______.
18.-(2x2-y2)-[2y2-(x2+2xy)]=______.
19.\u82e5-3a3b2\u4e0e5ax-1by+2\u662f\u540c\u7c7b\u9879,\u5219x=______,y=______.
20.(-y+6+3y4-y3)-(2y2-3y3+y4-7)=______.
4、(2x－y)2－2(2x－y)+1 5、3(2x+y)2+2(2x+y)
6、7x-(5x-5y)-y 7、2x-(3x-2y+2)+(3x-4y-1) 8、2x+2y-[3x-2(x-y)]
9、a+[a+b+c]-[b-a] 10、a×[b+c]-a[b-c] 11、a+b+(b-a)-b-a
12、{[a÷b]×{b÷a+1]}×{b÷a} 13、(3a+b)2 14、(-x+3y)2
15、(a+b)(a-b) 16、(-a-b)2 17、(2x+ )2
18、(3x+5y)+(5x-7y)-2(2x-4y) 19、(3x+5y)+(5x-7y)+2(2x-4y)
20、2（2a-3b）+3（2b-3a）
题呢？
1、a+(2b-3c-4d)=_________；
2、a-(-2b-3c+4d)=________；
3、(m-n)-3(z-p)=________；
4、3x-[5x-(2x-1)]=________；
5、4x2-[6x-(5x-8)-x2]=___________；
二、化简(28分)
1、(1)(3x+5y)+(5x-7y)-2(2x-4y)；
(2)5ab-{1、a+(2b-3c-4d)=
2、a-(-2b-3c+4d)=
3、(m-n)-3(z-p)=
4、3x-[5x-(2x-1)]=
5、4x2-[6x-(5x-8)-x2]=
6、(3x+5y)+(5x-7y)-2(2x-4y)；
7、5ab+[2a2b+(a2b-3ab)]-2a2b}
三、化简后求值(16分)
(2x2-x-1)-(x2-x- )+3(x2-1 ),其中x=1 。
四、1、7x-3y-4z=-(_________)；
2、a2-2ab-a-b=a2-2ab-(_________)；
3、5x3-4x2+2x-3=5x3-(_________)-3；
4、a3-a2b+ab2=-(_______)+ab2=a3-(________)；
5、5a2-6a+9b=5a2-3(_____)=-6a-(______)；
6、x3-3x2y+3xy2-y3=x3-3x2y-(_____)=x3-y3-(______)；
五、(1)(x3-4x2y+5xy2-3y3)-(-2xy2-4x3+x2y)；
(2)一个多项式减去3a4-a3+2a-1得5a4+3a2-7a+2，求这个多项式。
六、先化简下列各式，再求值(45分)
(1) x-2(x- )+3( x+ ),其中x=-4；
(2)(3xy-2x2)-(2x2-y2)-(y2-2xy)+(-y2+5x2+xy),其中x= ,y=- ；
(3)5xyz-{2x2y-[3xyz-(4xy2-x2y)]}其中x=-2,y=-1,z=3；
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