计算题,计算lim(x趋向1) [(x/x-1)-(1/lnx)]=

问题描述:

计算题,计算lim(x趋向1) [(x/x-1)-(1/lnx)]=
发错位置……估计是难有人回答了

lim(x->1)x/(x-1)-1/lnx
=lim(x->1)[xlnx-x+1]/(x-1)lnx
应用洛必达法则
=L'=lim(x->1)(lnx+1-1)/[lnx+1-1/x]
=lim(x->1)(1/x)/(1/x+1/x^2)
=1/2