(x-y)²×(y-x)³=

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(x-y)²×(y-x)³=

(x-y)²×(y-x)³
= -(x-y)²×(x-y)³
= -(x-y)5

因为(y-x)³=-(x-y)³。所以原式=-(x-y)的5次方。