需要20道整式的运算题 和20到化简求值题
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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)=______. 21.化简代数式4x2-[7x2-5x-3(1-2x x2)]的结果是______. 22.2a-b2 c-d3=2a ( )-d3=2a-d3-( )=c-( ). 23.3a-(2a-3b) 3(a-2b)-b=______. 24.化简代数式x-[y-2x-(x y)]等于______. 25.[5a2 ( )a-7] [( )a2-4a ( )]=a2 2a 1. 26.3x-[y-(2x y)]=______. 27.化简|1-x y|-|x-y|(其中x<0,y>0)等于______. 28.已知x≤y,x y-|x-y|=______. 29.已知x<0,y<0,化简|x y|-|5-x-y|=______. 30.4a2n-an-(3an-2a2n)=______. 31.若一个多项式加上-3x2y 2x2-3xy-4得 2x2y 3xy2-x2 2xy, 则这个多项式为______. 32.-5xm-xm-(-7xm) (-3xm)=______. 33.当a=-1,b=-2时, [a-(b-c)]-[-b-(-c-a)]=______. 34.当a=-1,b=1,c=-1时, -[b-2(-5a)]-(-3b 5c)=______. 35.-2(3x z)-(-6x) (-5y 3z)=______. 36.-5an-an 1-(-7an 1) (-3an)=______. 37.3a-(2a-4b-6c) 3(-2c 2b)=______. 38.9a2 [7a2-2a-(-a2 3a)]=______. 39.当2y-x=5时,5(x-2y)2-3(-x 2y)-100=______. 40.当x=-2时,二次三项式2x2 mx 4的值等于18,那么当x=2时,该二次三项式的值等于 41. (2010梧州)先化简,再求值:(-x2 5x 4) (5x-4 2x2),其中x=-2. 42. 先化简,再求值:3(x-1)-(x-5),其中x=2. 43.先化简,再求值:3(2x 1) 2(3-x),其中x=-1 44.先化简,再求值:-2(mn-3m2)-[m2-5(mn-m2) 2mn],其中m=1,n=-2. 45.先化简下式,再求值:5(3a2b-ab2)-4(-ab2 3a2b),其中a=-2,b=3. 46.求 的值,其中x=-2,y= . 47.先化简,再求值:5(3a2b-ab2)-3(ab2 5a2b),其中a= ,b=- . 48.先化简,再求值:(4a2-3a)-(1-4a 4a2),其中a=-2 49.化简求值:3x2y-[2x2y-3(2xy-x2y)-xy],其中x=-1,y=-2 50.先化简,再求值: ,其中x= .
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