因式分解 a²(x-y)+b²(y-x)

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因式分解 a²(x-y)+b²(y-x)

a²(x-y)-b²(x-y )=(a²-b²)(x-y )=(a -b )(a+b )(x-y )

(x-y)(a+b)(a-b)

a^2x-a^2y+b^2x-b^y x(a^2+b^2)-y(a^2+b^2) (a^2+b^2)(x-y)