(x方-1分之x-3)-(1-x分之3)

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(x方-1分之x-3)-(1-x分之3)(x方-1分之x-3)-(1-x分之3)(x方-1分之x-3)-(1-x分之3)(x-3)/(x^2-1)-3/(1-x)=(x-3)/[(x+1)(x-1)]

(x方-1分之x-3)-(1-x分之3)
(x方-1分之x-3)-(1-x分之3)

(x方-1分之x-3)-(1-x分之3)
(x-3)/(x^2-1)-3/(1-x)
=(x-3)/[(x+1)(x-1)]+3/(x-1)
=(x-3)/[(x+1)(x-1)]+3(x+1)/[(x+1)(x-1)]
=(x-3+3x+3)/[(x+1)(x-1)]
=4x/(x^2-1)