#include <iostream>#include <iomanip>#include <cmath>using namespace std;double fun(int h, int n){if (n <= 2)return n * h;elsereturn h / pow(2,n-2) + fun(h,n-1);}int main() { // 下落的高度和落地的次数 double h; int n; cin >> h; cin >> n; cout << fixed << setprecis...