#include <iostream>
using namespace std;
int main()
{
double a, b, an = 0;
int n;
scanf("%d", &n);
for (int i = 0; i < n; i++)
{
if (scanf("%lf", &a) == EOF) break;
b = a / (1 + ((a + an) * (a + an)));//Считаем форумулу
printf("\n%3.2lf %3.3lf", a, b);
an = a + an; // Запоминаем сумму
}
return 0;
}
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