因式分解:a²(x-y)+4b²(y-x)

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因式分解:a²(x-y)+4b²(y-x)

a²(x-y)+4b²(y-x)
=a²(x-y)-4b²(x-y)
=(x-y)(a²-4b²)
=(x-y)(a+2b)(a-2b)

a²(x-y)+4b²(y-x)
=(x-y)(a²-4b²)
=(x-y)(a+2b)(a-2b)