若f(n)=1+1/2+1/3...1/n,则f(2`k+1)比f(2`k)增加了几项?

问题描述:

若f(n)=1+1/2+1/3...1/n,则f(2`k+1)比f(2`k)增加了几项?

f(n)有n项,f(2k+1)有2k+1项,比前面的多了2k+1-n项.