(x-y)的三次方乘以(x-y)的平方乘以(y-x)

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(x-y)的三次方乘以(x-y)的平方乘以(y-x)

(x-y)的三次方乘以(x-y)的平方乘以(y-x)
=(x-y)³×﹙x-y)²×[-(x-y)]
=-(x-y)的6次方