(x-y)²·(x-y)³-(x-y)的四次方·(y-x)=

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(x-y)²·(x-y)³-(x-y)的四次方·(y-x)=

(x-y)²·(x-y)³-(x-y)的四次方·(y-x)=
(x-y)²·(x-y)³-(x-y)的四次方·(y-x)=

(x-y)²·(x-y)³-(x-y)的四次方·(y-x)=
(x-y)²·(x-y)³-(x-y)的四次方·(y-x)
=(x-y)的5次方+(x-y)的5次方
=(x-y)的10次方