求这两道题答案
1个回答
展开全部
(5)
lim(x->0) (1-cosx)/(x.cosx) (0/0)
=lim(x->0) sinx/(-x.sinx+cosx)
=0
(6)
x/(1+x)
=1 - 1/(1+x)
let
1/y = 1/(1+x)
lim(x->∞) [ x/(1+x) ]^(-x-5)
=lim(x->∞) [ 1- 1/(1+x) ]^(-x-5)
=lim(y->∞) [ 1- 1/y ]^(-y+1-5)
=lim(y->∞) [ 1- 1/y ]^(-y-4)
=lim(y->∞) [ 1- 1/y ]^(-y)
=e
lim(x->0) (1-cosx)/(x.cosx) (0/0)
=lim(x->0) sinx/(-x.sinx+cosx)
=0
(6)
x/(1+x)
=1 - 1/(1+x)
let
1/y = 1/(1+x)
lim(x->∞) [ x/(1+x) ]^(-x-5)
=lim(x->∞) [ 1- 1/(1+x) ]^(-x-5)
=lim(y->∞) [ 1- 1/y ]^(-y+1-5)
=lim(y->∞) [ 1- 1/y ]^(-y-4)
=lim(y->∞) [ 1- 1/y ]^(-y)
=e
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询
广告 您可能关注的内容 |