七年级数学上册整式的加减计算题1无答案新人教版

1、整式的加减计算题1. ab-4ab+8ab-7ab+ab37x-(5x-5y)-y523a3bc2-15ab2c+8abc-24a3bc2-8abc 7-7x2+6x+13x2-4x-5x292y+(-2y+5)-(3y+2)11(2x2-3xy+4y2)+(x2+2xy-3y2) 132a-(3a-2b+2)+(3a-4b-1) 15-6x2-7x2+15x2-2x2 22x-(x+3y)-(-x-y)-(x-y) 42x+2y-3x-2(x-y)65-(1-x)-1-(x-1) 8( )+(4xy+7x2-y2)=10x2-xy 10(4xy2-2x2y)-( )=x3-2x2y+4xy2

2、+y3 12已知a=x3-2x2+x-4，b=2x3-5x+3，计算a+b 14已知a=x3-2x2+x-4，b=2x3-5x+3，计算a-b 16若a=-0.2，b=0.5，求代数式-(|a2b|-|ab2|)的值 17一个多项式减去3m4-m3-2m+5得-2m4-3m3-2m2-1，那么这个多项式等于_ 19-(2x2-y2)-2y2-(x2+2xy)21若-3a3b2与5ax-by+2是同类项，求xy的值 23计算化简:(-y+6+3y4-y3)-(2y2-3y3+y4-7) 25化简代数式4x2-7x2-5x-3(1-2x+x2) 272a-2b+c-3d=2a+( )-d=2a-3

3、d-( )=c-( ) 29化简3a-(2a-3b)+3(a-2b)-b 185a2+( )a-7+( )a2-4a+( )=a2+2a+1 20化简3x-y-(2x+y) 22化简|1-x+y|-|x-y|(其中x0，y0) 24已知xy，化简x+y-|x-y| 26已知x0，y0，化简|x+y|-|5-x-y| 28化简4a2n-an-(3an-2a2n)、30若一个多项式加上-3x2y+2x2-3xy-4得 2x2y+3xy2-x2+2xy， 求这个多项式31化简-5xm-xm-(-7xm)+(-3xm) 33当a=-1，b=-2时，求 a-(b-c)-b-(-c-a)的值 35当a=-

4、1，b=1，c=-1时，求 -b-2(-5a)-(-3b+5c)的值 37化简-2(3x+z)-(-6x)+(-5y+3z) 39-5an-an+1-(-7an+1)+(-3an) 413a-(2a-4b-6c)+3(-2c+2b) 439a2+7a2-2a-(-a2+3a) 45当2y-x=5时，5(x-2y)2-3(-x+2y)-100 32(4x2-8x+5)-(x3+3x2-6x+2) 34(0.3x3-x2y+xy2-y3)-(-0.5x3-x2y+0.3xy2) 36-2a2b-3abc-(4ab2-a2b) 38(5a2b+3a2b2-ab2)-(-2ab2+3a2b2+a2b)

5、 40(x2-2y2-z2)-(-y2+3x2-z2)+(5x2-y2+2z2) 42(3a6-a4+2a5-4a3-1)-(2-a+a3-a5-a4) 44(4a-2b-c)-5a-8b-2c-(a+b) 46(2m-3n)-(3m-2n)+(5n+m) 47(3a2-4ab-5b2)-(2b2-5a2+2ab)-(-6ab) 49xy-(2xy-3z)+(3xy-4z) 51(-3x3+2x2-5x+1)-(5-6x-x2+x3) 533x-(2x-4y-6x)+3(-2z+2y) 55(-x2+4+3x4-x3)-(x2+2x-x4-5) 57若a=5a2-2ab+3b2，b=-2b2+3ab-a2，计算a+b 59已知a=3a2-5a-12，b=2a2+3a-4，求2(a-b) 612m-3n+-4m-(3m-n) 484(x-y+z)-2(x+y-z)-3(-x-y-z) 502(x2-2xy+y2-3)+(-x2+y2)-(x2+2xy+y2) 522(a2-ab-b2)-3(4a-2b)+2(7a2-4ab+b2) 54.2x2-3x-4x2-(3x2-x)+(x-x2) 56：-(7x-y-2z)-4x-(x-y-z)-3x+z-x 58:(+