(x-y)的5次方(y-x)的5次方+[(x-y)的5次方]²

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(x-y)的5次方(y-x)的5次方+[(x-y)的5次方]²

(x-y)的5次方(y-x)的5次方+[(x-y)的5次方]²
(x-y)的5次方(y-x)的5次方+[(x-y)的5次方]²

(x-y)的5次方(y-x)的5次方+[(x-y)的5次方]²
(x-y)的5次方(y-x)的5次方+[(x-y)的5次方]²
=-(x-y)的10次方+(x-y)的10次方
=0