C3x2y-2xy2)-(xy2-2x2y),其中x=-1,y=2

C3x2y-2xy2)-(xy2-2x2y),其中x=-1,y=2 -3x2+2x2y+xy2 x3+2x2+xy2因式分解 (xy2)2÷(xy2)3 3x2y+xy2-[2xy2-4x2y+(x2y-2xy2)] -xy2/2是不是单项式? 5xy2-【3xy2-(4xy2-2x2y)】+2x2y】+2x2y-xy2 化简,再求值 计算:3xy(x2y-xy2+xy)-xy2(2x2-3xy+2x)因式分解 -2x2y(-2xy2)2+(2xy)3×( xy2) -3x2y+2x2y+3xy2-2xy2 (X3-2x2y+xy2)÷（x3-xy2）要求约分 计算题：(-1/3xy2)[xy(2x-y)+xy2], （xy2次方）2次方 x3-2x2y+xy2-x 因式分解:x3-2x2y+xy2 xy2·(-xy)2化简 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.