Question

(x-y)的平方乘以(y-x)的三次方+(x-y)乘以(x-y)的四次方

Answer 1

(x-y)的平方乘以(y-x)的三次方+(x-y)乘以(x-y)的四次方
=-(x-y)^2(x-y)^3+(x-y)(x-y)^4
=-(x-y)^5+(x-y)^5
=0