x/(x-1)+2/(x+1)=1两边乘(x+1)(x-1)x(x+1)+2(x-1)=(x-1)(x+1)x^2+x+2x-2=x^2-1 3x=1 x=1/3经检验,x=1/3是方程的解x/(2x-5) +5/(5-2x)=1两边乘2x-5x-5=2x-5x=0经检验,x=0是方程的解3/x = 5/(x+2)两边乘x(x+2)3x+6=x+5x=-1/2经检验,x=-1/2是方程的解