题解

#include<bits/stdc++.h>
using namespace std;
#define ll long long
int main() {
    double a,b,c;
    cin>>a>>b>>c;
    printf("%.2f",max(a,max(b,c))/(max((a+b),max(b,c))*max(a,max(b,b+c))));
    return 0;
}