(x-y)³除以（y-x)

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(x-y)³除以（y-x)
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(x-y)³除以（y-x)
(x-y)³除以（y-x)

(x-y)³除以（y-x)
解
(x-y)³÷(y-x)
=[-(y-x)]³÷(y-x)
=-(y-x)²