1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10+1/11+1/12+1/13+1/14+1/15+1/16+1/17+1/18+1/19+1/20=?

约等于2.59774

解法，C语言编程求解：

#include <cstdlib>
#include <iostream>

using namespace std;

int main(int argc, char *argv[])
{
double i;
double s=0;
for(i=2;i<=20;i++)
s=s+1/i;
cout<<s;

system("PAUSE");
return EXIT_SUCCESS;
}

布吉岛 虾米问题 咋那么复杂