xy(x+y)的平方-4x三次方y三次方

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xy(x+y)的平方-4x三次方y三次方

xy(x+y)²-4x³y³
=xy[(x+y)²-4x²y²]
=xy(x+y+2xy)(x+y-2xy)

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