1-1/(x+1)=2/(x+1)(x-1)两边乘(x+1)(x-1)x²-1-x+1=2x²-x-2=0(x-2)(x+1)=0x=2,x=-1经检验,x=-1时公分母(x+1)(x-1)=0舍去所以x=2
1-1/(x+1)=2/(x^2-1) 【两边乘以x^2-1】(x^2-1)-(x-1)=2x^2-x-2=0(x-2)(x+1)=0x=2或x=-1检验:x=-1是增根,则原方程的解是:x=2