解:x/x-1*(x-1)(x+2)-(x-1)(x+2)=3/(x-1)(x+2)*(x-1)(x+2) x(x+2)-(x-1)(x+2)=3 x^2+2x-x^2-x+2=3 x=1把x=1带入(x-1)(x+2)=0所以x=1是原分式方程的曾根所以此分式方程无实数根
两边同乘(x-1)(x+2)x^2+2x-x^2-x+2=3x=1x-1=0经检验,x=1是原方程增根原方程无解