化简:(x/(x-1)-2x/(x+1))÷x/(x2-1)

化简:(x/(x-1)-2x/(x+1))÷x/(x2-1)
化简:(x/(x-1)-2x/(x+1))÷x/(x2-1)

化简:(x/(x-1)-2x/(x+1))÷x/(x2-1)
原式=（x²+x-2x²+2x)/(x+1)(x-1)×(x+1)(x-1)/x
=(-x²+3x)/x
=-x+3

原式=(x²+x-2x²-2x)/(x+1)(x-1)*(x+1)(x-1)/x
=(x²+x-2x²-2x)/x
=x+1-2x-2
=-x-1