(x-y)的6次方×(y-x)的5次方×(x-y)的4次方

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(x-y)的6次方×(y-x)的5次方×(x-y)的4次方
(x-y)的6次方×(y-x)的5次方×(x-y)的4次方

(x-y)的6次方×(y-x)的5次方×(x-y)的4次方
(x-y)的6次方×(y-x)的5次方×(x-y)的4次方
=(y-x)的6次方×(y-x)的5次方×(y-x)的4次方
=(y-x)的(6+5+4)次方
=(y-x)的15次方

(x-y)的6次方×(y-x)的5次方×(x-y)的4次方
=-(x-y)^15

(y-x)的十五次方