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- #include <iostream>
- #include <cmath>
- #define ABS(x) ((x) < 0 ? (-(x)) : (x))
- // Рекурсивная функция
- double f(int n, int prevX, int prevPrevX, int finalN) {
- double value = (double)prevX / (n - 1) * 2 + prevPrevX;
- if (n == finalN) return value;
- return f(n + 1, value, prevX, finalN);
- }
- // Цикл
- int main() {
- setlocale(LC_ALL, "Russian");
- int n;
- std::cout << "Введите N: ";
- std::cin >> n;
- std::cout << f(3, 3, 5, n) << std::endl;
- return 0;
- }
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