题解

#include<bits/stdc++.h>
using namespace std;
double da(double x,double y,double z){
    return max({x,y,z})/(max({x+y,y,z})*max({x,y,y+z}));
}
int main(){
    double a,b,c;
    cin>>a>>b>>c;
    printf("%.2lf",da(a,b,c));
    return 0;
}