x/x+1 - 2x-2-1/x =0 两边同乘x(x+1) 得x2 -( 2x-2-1)*(x+1)=0 x2-(2x-3)(x+1)=0 x2--2x2-2x+3x+3=0 x2-x-3=0 x2-x-=13/4 (x-)=13/4 x-=正负根号13/4 x1=(根号13+1)/2 x2=(-根号13+1)/2希望采纳