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
1、5y+2x-(5y-2x) 2、x(x-y)+x(y-x) 3、(x-y)2-(x-y)
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)化间求值:
1、-9(x-2)-y(x-5)
(1)化简整个式子.
(2)当x=5时,求y的解.
2、5(9+a)×b-5(5+b)×a
(1)化简整个式子.
(2)当a=5/7时,求式子的值.
3、62g+62(g+b)-b
(1)化简整个式子.
(2)当g=5/7时,求b的解.
4、3(x+y)-5(4+x)+2y
(1)化简整个式子.
5、(x+y)(x-y)
(1)化简整个式子.
6、2ab+a×a-b
(1)化简整个式子.
7、5.6x+4(x+y)-y
(1)化简整个式子.
8、6.4(x+2.9)-y+2(x-y)
(1)化简整个式子.
9、(2.5+x)(5.2+y)
(1)化简整个式子.
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=______.
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