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ertaoLee

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#include
#include
using namespace std;
int main()
{
long double sum=0.0,frac;
long double a=2,b=1,c;
int i;
int j;
cin>>j;
cout<<"sum"< for(i=1;i<=j;i++)
        {
        frac=a/b;
        c=b;
        b=a;
        a+=c;
        sum+=frac;
        cout<<"i="<         }
return 0;
}

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i=23599ʱsum=3.818428e+04
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