(x+1)/x-6/(x²-1)=1通分,左右同乘x(x²-1)得(x+1)(x²-1)-6x=x(x²-1)x³+x²-x-1-6x=x³-xx²-6x-1=0x²-6x+9=10(x-3)²=10x-3=±√10x=3±√10