极限的运算法则!

问题描述:

极限的运算法则!
已知 lim(2n+1)an=3,lim(nan)=

lim an=lim [(2n+1)an]/(2n+1)=lim [(2n+1)an] × lim 1/(2n+1)=3×0=0
所以,3=lim [(2n+1)an]=2×lim nan + lim an=2×lim nan
所以,lim nan = 3/2