因式分解-X^2Y+2XY^2-Y^3
问题描述：
因式分解-X^2Y+2XY^2-Y^3
答
=-y(x^2-2xy+y^2)
=-y(x-y)^2
答
-x²y+2xy²-y^3
=-y(x²-2xy+y²)
=-y(x-y)²