七年级整式加减计算题.doc

七年级整式加减计算题3ab-4ab+8ab-7ab+ab=_ 47x-(5x-5y)-y=_ 523a3bc2-15ab2c+8abc-24a3bc2-8abc=_ 6-7x2+6x+13x2-4x-5x2=_ 72y+(-2y+5)-(3y+2)_ 11(2x2-3xy+4y2)+(x2+2xy-3y2)=_ 122a-(3a-2b+2)+(3a-4b-1)=_ 13-6x2-7x2+15x2-2x2_ 142x-(x+3y)-(-x-y)-(x-y)_ 162x+2y-3x-2(x-y)=_ 175-(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_ 302a-b2+c-d3=2a+( )-d3=2a-d3-( )=c-( ) 313a-(2a-3b)+3(a-2b)-b=_ 32化简代数式x-y-2x-(x+y)等于_ 335a2+( )a-7+( )a2-4a+( )=a2+2a+1 343x-y-(2x+y)=_ 35化简|1-x+y|-|x-y|(其中x0，y0)等于_ 36已知xy，x+y-|x-y|=_ 37已知x0，y0，化简|x+y|-|5-x-y|=_ 384a2n-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)_ 463a-(2a-4b-6c)+3(-2c+2b)=_ 489a2+7a2-2a-(-a2+3a)=_ 50当2y-x=5时，5(x-2y)2-3(-x+2y)-100=_ (4x2-8x+5)-(x3+3x2-6x+2) 72(0.3x3-x2y+xy2-y3)-(-0.5x3-x2y+0.3xy2) 73-2a2b-3abc-(4ab2-a2b) 74(5a2b+3a2b2-ab2)-(-2ab2+3a2b2+a2b) 75(x2-2y2-z2)-(-y2+3x2-z2)+(5x2-y2+2z2) 76(3a6-a4+2a5-4a3-1)-(2-a+a3-a5-a4) 77(4a-2b-c)-5a-8b-2c-(a+b) 78(2m-3n)-(3m-2n)+(5n+m) 79(3a2-4ab-5b2)-(2b2-5a2+2ab)-(-6ab) 80xy-(2xy-3z)+(3xy-4z) 81(-3x3+2x2-5x+1)-(5-6x-x2+x3) 833x-(2x-4y-6x)+3(-2z+2y) 84(-x2+4+3x4-x3)-(x2+2x-x4-5) 85若A=5a2-2ab+3b2，B=-2b2+3ab-a2，计算A+B 86已知A=3a2-5a-12，B=2a2+3a-4，求2(A-B) 872m-3n+-4m-(3m-n) 885m2n+(-2m2n)+2mn2-(+m2n) 894(x-y+z)-2(x+y-z)-3(-x-y-z) 902(x2-2xy+y2-3)+(-x2+y2)-(x2+2xy+y2) 922(a2-ab-b2)-3(4a-2b)+2(7a2-4ab+b2) 93.2x2-3x-4x2-(3x2-x)+(x-x2) 94：-(7x-y-2z)-4x-(x-y-z)-3x+z-x