(x-y)的四次方(x-y)-2(x-y)²(y-x)³等于?

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(x-y)的四次方(x-y)-2(x-y)²(y-x)³等于?
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(x-y)的四次方(x-y)-2(x-y)²(y-x)³等于?
(x-y)的四次方(x-y)-2(x-y)²(y-x)³等于?

(x-y)的四次方(x-y)-2(x-y)²(y-x)³等于?
(x-y)的四次方(x-y)-2(x-y)²(y-x)³
=(x-y)的五次方+2(x-y)五次方
=3倍(x-y)五次方