(x-1)²分之3-(x-1)²分之3x

问题描述:

(x-1)²分之3-(x-1)²分之3x

(x-1)²分之3-(x-1)²分之3x
=(x-1)²分之(3-3x)
=-3(x-1)/(x-1)²
=-3/(x-1)