约分3(x-y)/(y-x)^2
问题描述:
约分3(x-y)/(y-x)^2
答
3(x-y)/(y-x)^2
=3(x-y)/(x-y)^2
3/(x-y)
约分3(x-y)/(y-x)^2
3(x-y)/(y-x)^2
=3(x-y)/(x-y)^2
3/(x-y)