求50道初一化简代数式(带答案)

如题所述

第1个回答  2022-07-21
化简求值 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. 34.3x-[y-(2x+y)]=______. 35.化简|1-x+y|-|x-y|(其中x0)等于______. 36.已知x≤y,x+y-|x-y|=______. 37.已知x<0,y<0,化简|x+y|-|5-x-y|=______. 38.4a2n-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)=______. 46.3a-(2a-4b-6c)+3(-2c+2b)=______. 48.9a2+[7a2-2a-(-a2+3a)]=______. 50.当2y-x=5时,5(x-2y)2-3(-x+2y)-100=______.

化简代数式50道题
化简代数式如下:化简:3x+2y−x+y。化简:4(x+y)−3(x−y)。化简:a+2(b−c)−3(a−b+2c)。化简:(2a+b)(2a−b)。化简:(3x+2y)(3x−2y)。化简:x+(2x−1)−(3x+5)。化简:3(x−y)...

化简代数式(初一)
3(-ab+2a)-(3a-b) = -3ab+6a-3a+b = -3ab+3a+b 14(abc-2a)+3(6a-2abc) =14abc-28a+18a-6abc =8abc-10a 3(xy-2z)+(-xy+3z) =3xy-6z-xy+3z =2xy-3z -4(pq+pr)+(4pq+pr) = -4pq-4pr+4pq+pr = -3pr ...

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1.3a+6+2a+8=? =3a+2a+6+8 =5a+14 2.2m-4n+(-7m)+3n=? =2m-4n-7m+3n =2m-7m-4n+3n = -5m-n 3.(-5a)-4b+(-2a)+2b=? = -5a+4b-2a+2b = -7a+6b 4. 4a+2b-3a-6b=? =4a-3a+2b-6b =a-4b 5. 3x-2y-2x+y=? =3x-2x-2y+y =x-y 6. 4b-3-2b+2=?

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