代码：

#include <bits/stdc++.h>
using namespace std;
double f(int x, int n) {
	if (n == 1) return x / (1 + x);
	else return x / (f(x, n - 1) + n);
}
double x;
int  n;
int main() {
	scanf("%lf\nd", &x, &n);
	printf("%.2lf", f(x, n));
	return 0;
}
  

悬赏关注