limx趋近于1 x^2-1/inx
问题描述:
limx趋近于1 x^2-1/inx
答
答:
lim(x→1) (x^2-1) / lnx
=lim(x→1) (x-1)(x+1) / lnx
=lim(x→1) (1+1)*(x-1) / lnx
=lim(x→1) 2(x-1) / lnx
=lim(x→1) 2 / (1/x)
=2