问题标题:
4xy(x-y)-(y-x)³
问题描述:
4xy(x-y)-(y-x)³
郝丽锋回答:
4xy(x-y)-(y-x)³
=4xy(x-y)+(x-y)³
=(x-y)[4xy+(x-y)²]
=(x-y)(x+y)²
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