(x-y)的2次方×(y-x)的3次方×（x-y）=
问题描述：
(x-y)的2次方×(y-x)的3次方×（x-y）=
答
原式=(x-y)²[-(x-y)]²(x-y)
=(x-y)²[-(x-y)³](x-y)
=-(x-y)^(2+3+1)
=-(x-y)^6