5xy2-【3xy2-(4xy2-2x2y)】+2x2y】+2x2y-xy2 化简,再求值

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.