因式分解:x²(x-y)+y²(y-x)
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x²(x-y)+y²(y-x)
=x²(x-y)-y²(x-y)
=(x²-y²)(x-y)
=(x-y)(x+y)(x-y)
=(x-y)²(x+y)
=x²(x-y)-y²(x-y)
=(x²-y²)(x-y)
=(x-y)(x+y)(x-y)
=(x-y)²(x+y)
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