#include <iostream> #include <cstdio> #include <string> #include <cstring> #include <algorithm> #include <cmath> using namespace std; #define MAX(a,b) (a)>(b)?(a):(b); #define MAXN 10010 typedef long long ll; int main() { int n; while(~scanf("%d",&n)) { for(int i=0;i<n;i++) { int a,b; scanf("%d%d",&a,&b); printf("%.5lf\n",a/(1.0*(a+b))); } } return 0; } |
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