[(x-y)^3]^6×(y-x)^3×3(x-y)^2
问题描述：
[(x-y)^3]^6×(y-x)^3×3(x-y)^2
答
答：
[(x-y)^3]^6×(y-x)^3×3(x-y)^2
=[(x-y)^18]×[-(x-y)^3]×3(x-y)^2
=-3(x-y)^(18+3+2)
=-3(x-y)^23
=3(y-x)^23