1.7x+5y= 2.3ab-5ab= 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 本文来源：https://www.wddqw.com/doc/ff719c165b1b6bd97f192279168884868762b8ea.html