(x-y)的平方乘以(y-x)的三次方+(x-y)乘以(x-y)的四次方

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(x-y)的平方乘以(y-x)的三次方+(x-y)乘以(x-y)的四次方
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(x-y)的平方乘以(y-x)的三次方+(x-y)乘以(x-y)的四次方
(x-y)的平方乘以(y-x)的三次方+(x-y)乘以(x-y)的四次方

(x-y)的平方乘以(y-x)的三次方+(x-y)乘以(x-y)的四次方
(x-y)的平方乘以(y-x)的三次方+(x-y)乘以(x-y)的四次方
=-(x-y)^2(x-y)^3+(x-y)(x-y)^4
=-(x-y)^5+(x-y)^5
=0

=(Y-X)的5次方+(X-Y)的5次方
=0