(x-y)²×(y-x)³=

(x-y)²×(y-x)³=
(x-y)²×(y-x)³=

(x-y)²×(y-x)³=
(x-y)²×(y-x)³
= -(x-y)²×(x-y)³
= -(x-y)5

因为（y-x）³=-（x-y）³。所以原式=-（x-y）的5次方。