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- #include <iostream>
- using namespace std;
- //Llegeix triplets de naturals
- //Escriu la suma de 1/a + 1/a+k + 1/a+2k ... fins que el denominador sigui més gran que b
- int main() {
- cout.setf(ios::fixed);
- cout.precision(4);
- double a, b, k;
- while (cin >> a >> b >> k) {
- double mult = 0;
- double sumfrac = 0;
- while ((a + mult*k) <= b) {
- sumfrac = sumfrac + (1/(a + mult*k));
- ++mult;
- }
- cout << sumfrac << endl;
- }
- }
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