化简 (x^2+2y^2)(x-2y)+2xy(x-y)
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化简(x^2+2y^2)(x-2y)+2xy(x-y)化简(x^2+2y^2)(x-2y)+2xy(x-y)化简(x^2+2y^2)(x-2y)+2xy(x-y)原式=x^3-2x^2y+2xy^2-
化简 (x^2+2y^2)(x-2y)+2xy(x-y)
化简 (x^2+2y^2)(x-2y)+2xy(x-y)
化简 (x^2+2y^2)(x-2y)+2xy(x-y)
原式=x^3-2x^2y+2xy^2-4y^3+2x^2y-2xy^2
=x^3-4y^3
x^3-4y^3