#include
double fun(int n)
{
double sum=0.0;
while(n)
{
sum+=n*n/(n+1.0);
n--;
}
return sum;
}
void main()
{
int n;
printf("请输入n (n
求和:s=1^2/(1+1)+2^2/(2+1)+3^2/(3+1)+.n^2/(n+1) (n
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