百度知道 - 信息提示

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.已知A=x3-2x2+x-4,B=2x3-5x+3,计算A+B=______. 15.已知A=x3-2x2+x-4,B=2x3-5x+3,计算A-B=______. 16.若a=-0.2,b=0.5,代数式-(|a2b|-|ab2|)的值为______. 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______. 18.-(2x2-y2)-[2y2-(x2+2xy)]=______. 19.若-3a3b2与5ax-1by+2是同类项,则x=______,y=______. 20.(-y+6+3y4-y3)-(2y2-3y3+y4-7)=______.

你百度文库上下载就可以，如果你不会下载的话告诉我你的qq,我下载完发给你