Question

化简求值（x^2-2x+1）/（x^2-1）+(x-1)/(x^2+x)-x其中X=2004

Answer 1

原式=(x-1)²/(x+1)(x-1)+(x-1)/x(x+1)-x

=(x-1)/(x+1)+(x-1)/x(x+1)-x

=(x²-x+x-1)/x(x+1)-x

=(x+1)(x-1)/x(x+1)-x

=(x-1)/x-x

=-2003又1/2004