limx趋近于1(x╱x-1-2╱x2-1)
问题描述：
limx趋近于1(x╱x-1-2╱x2-1)
答
通分
=lim[(x2+x)/(x2-1)-2/(x2-1)]
=lim(x2+x-2)/(x2-1)
=lim(x+2)/(x+1)
=3/2