-2x2y(-2xy2)2+(2xy)3×( xy2)

3x2y+xy2-[2xy2-4x2y+(x2y-2xy2)] -2x2y(-2xy2)2+(2xy)3×( xy2) 5xy2-【3xy2-(4xy2-2x2y)】+2x2y】+2x2y-xy2 化简,再求值 -3x2y+2x2y+3xy2-2xy2 -3x2+2x2y+xy2 计算:3xy(x2y-xy2+xy)-xy2(2x2-3xy+2x)因式分解 (6x2y-xy2-1/2x2y3)/(-3xy) x3-2x2y+xy2-x 因式分解:x3-2x2y+xy2 试说明代数式(x3+3x2y-4xy2+6y3)-(2x3-x2y-xy2-y3-1)+(x34x2y+3xy2-7y3)的值与xy取值无关 当x等于1,y等于2时,求代数式3xy2-【2xy2-2(xy-1.5x2y)】+xy-3x2y的值 已知(x+2)2+|y+1|=0,求3x2y-[2x2y-2(xy-二分之三x2y)+xy]+3xy2的值 在2x2y,-2xy2,3x2y,-xy四个单项式中,找出两个同类项,并合并这两个同类项 求[2（x2y-xy2）+xy（2xy-x2）]÷x2y注：x2 xy2 x2y中的2是平方,我不会打平方的符号 若x-y=3,xy=-2,则xy2-x2y的值是 x3+2x2y+2xy2+y3因式分解 分解因式：x3+xy2－2x2y (X3-2x2y+xy2)÷（x3-xy2）要求约分