1/(2+2x)-x/(x2-1)+1/(x-1)分式加减

1/(2 + 2x) - x/(x^2 - 1) + 1/(x - 1)= 1/2(x + 1) - x/(x + 1)(x - 1) + 1/(x - 1)= (x - 1)/2(x + 1)(x - 1) - 2x/2(x + 1)(x - 1) + 2(x + 1)/2(x + 1)(x - 1)= [ (x - 1) - 2x + 2(x + 1)]/2(x + 1)(x - 1)= ( ...