计算3(x-y)^3【-1/3（y-x）】^2
问题描述：
计算3(x-y)^3【-1/3（y-x）】^2
答
你好,爱的繁体
3(x-y)³[-1/3(y-x)]²
=3(x-y)³[1/9(x-y)²]
=[3×(1/9)](x-y)^5
=1/3(x-y)^5