Question

(x方-1分之x-3)-(1-x分之3)

Answer 1

(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)