(x的2次方-1)分之3x÷(1-(x+1)分之1)

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(x的2次方-1)分之3x÷(1-(x+1)分之1)
(x的2次方-1)分之3x÷(1-(x+1)分之1)

(x的2次方-1)分之3x÷(1-(x+1)分之1)
=3x/(x+1)(x-1)÷(x+1-1)/(x+1)
=3x/(x+1)(x-1)×(x+1)/x
=3/(x-1)