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#include <stdio.h>
#include <stdlib.h>
int main()
{
int i,n;
printf("输入n值(大于2000)\n");
scanf("%d",&n);
double s=1;
double sum=0;
for(i=0;i<=n;i++){
if(i==0)
s=1;
else
s*=(double)i/(2*i+1);
sum+=(double)s;
}
printf("%f",sum);
system("pause");
return 0;
}
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