#define _USE_MATH_DEFINES
#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <complex>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
#include <iterator>
using namespace std;

int main()
{
    int m;
    cin >> m;

    while(--m >= 0){
        int a, b;
        double t;
        cin >> a >> b >> t;

        double n;
        if(a == 0){
            n = pow(M_E, pow(t, 1.0 / b));
        }
        else if(b == 0){
            n = pow(t, 1.0 / a);
        }
        else{
            t = pow(t, 1.0 / b) * a / b;

            double left = 0.0;
            double right = 100.0;
            for(int i=0; i<50; ++i){
                double x = (left + right) / 2.0;
                double y = x * log(x);
                if(y < t)
                    left = x;
                else
                    right = x;
            }
            n = pow(left, b / (double)a);
        }

        printf("%.10f\n", n);
    }

    return 0;
}