(x-y)平方乘以(x-y)的3次方乘以(y-x)平方乘以(y-x)的3次方

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(x-y)平方乘以(x-y)的3次方乘以(y-x)平方乘以(y-x)的3次方
(x-y)平方乘以(x-y)的3次方乘以(y-x)平方乘以(y-x)的3次方

(x-y)平方乘以(x-y)的3次方乘以(y-x)平方乘以(y-x)的3次方
(x-y)^2(x-y)^3*(y-x)^2*(y-x)^3
=-(x-y)^2(x-y)^3*(x-y)^2*(x-y)^3
=-(x-y)^10