using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        var m = int.Parse(Console.ReadLine());

        var a = new List<int>();
        var b = new List<int>();
        var t = new List<double>();
        double ans;

        for (int i = 0; i < m; i++)
        {
            var str = Console.ReadLine().Split(' ');
            a.Add(int.Parse(str[0]));
            b.Add(int.Parse(str[1]));
            t.Add(double.Parse(str[2]));

            if (b[i] == 0) ans = Math.Pow(t[i], 1.0 / a[i]);
            else
            {
                for (double n = 1.0; ;)
                {
                    var tmp1 = Math.Pow(t[i], 1.0 / b[i]);
                    var tmp2 = Math.Pow(n, (double)a[i] / b[i]);
                    var tmp3 = n - Math.Exp(tmp1 / tmp2);

                    if (Math.Abs(tmp3) < 10e-10)
                    {
                        ans = n;
                        break;
                    }
                    else n -= tmp3 / 4.0;
                }
            }

            Console.WriteLine("{0:.##########}", ans);
        }
    }
}