x+1-x²/(x-1)
=(x²-1-x²)/(x²-1)
=1/(x²-1)
=1/(2+2根號(hào)下2)
=（根號(hào)下2-1)/2能詳細(xì)點(diǎn)嗎第一步我都不知道你怎么得到的sorry上面算錯(cuò)了 看不懂繼續(xù)問(wèn)。(x+1)-x²/(x-1)=(x+1)(x-1)/(x-1)-x²/(x-1)=(x²-1-x²)/(x-1)=-1/(x-1)=-1/(根號(hào)下2+1-1)=-1/根號(hào)下2=-根號(hào)下2/2