(x-1)²分之3-(x-1)²分之3x

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(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-(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)