作业帮5xy2-【3xy2-(4xy2-2x2y)】+2x2y】+2x2y-xy2 化简,再求值
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5xy2-【3xy2-(4xy2-2x2y)】+2x2y】+2x2y-xy2 化简,再求值
5xy2-【3xy2-(4xy2-2x2y)】+2x2y】+2x2y-xy2 化简,再求值
5xy2-【3xy2-(4xy2-2x2y)】+2x2y】+2x2y-xy2 化简,再求值
5xy2-【3xy2-(4xy2-2x2y)】+2x2y】+2x2y-xy2
=5xy2-3xy2+4xy2-2x2y-2x2y+2x2y-xy2
=5xy²-2x²y
5xy²-[3xy²-(4xy²-2x²y)+2x²y]+2x²y-xy²
=5xy²-(3xy²-4xy²+2x²y+2x²y)+2x²y-xy²
=5xy²-3xy²+4xy²-2x²y-2x²y+2x²y-xy²
=5xy²-2x²y
原式=5xy2-(3xy2-4xy2+2x2y+2x2y)+2x2y-xy2
=4xy2-(-xy2+4x2y)+2x2y
=4xy2+xy2-4x2y+2x2y
=5xy2-2x2y
5xy2-【3xy2-(4xy2-2x2y)】+2x2y】+2x2y-xy2 化简,再求值
3x2y+xy2-[2xy2-4x2y+(x2y-2xy2)]
(xy2)2÷(xy2)3
-3x2+2x2y+xy2
x3+2x2+xy2因式分解
计算:3xy(x2y-xy2+xy)-xy2(2x2-3xy+2x)因式分解
已知:(x+2)2+|y+1|=0,求5xy2-{2x2y-[3xy2-(4xy2-2x2y)]}的值
化简：5（3x2y-xy2) * (xy2+3x2y)
-2x2y(-2xy2)2+(2xy)3×( xy2)
-3x2y+2x2y+3xy2-2xy2
计算题：(-1/3xy2)[xy(2x-y)+xy2],
先化简,再求值:3x2y2-[5xy2-(4xy2-3)+2x2y2],其中x=-3,y=2.
x.y取何值时,代数(x3y+3x2y-5xy2+6y3)+(y3+2xy2+x2y-2x3)-(4x2y-x3-3xy2+7y3).y取何值时，代数（x3y+3x2y-5xy2+6y3）+（y3+2xy2+x2y-2x3）-（4x2y-x3-3xy2+7y3）的值都是常数?
4x2的平方×(-xy2的平方)3的平方
因式分解：-x3+4x2-4xy2
化简-x2-3x+2x2+4x.xy2-2/3x2y-xy2/2+2x2y.2a-1/2ab-（a2-ab）
已知(x+3)2+▕x-y+10▏=0求代数式5x2y-【2x2-（3xy-xy2）-3x2】-2xy2-y2的值.
已知(x+3)2+▕x-y+10▏=0求代数式5x2y-【2x2-（3xy-xy2）-3x2】-2xy2-y2的值.