import std.stdio;
import std.array;
import std.string;
import std.conv;
import std.algorithm;
import std.typecons;
import std.range;
import std.random;
import std.math;
import std.container;
import std.numeric;
import core.bitop;


void main() {
  auto M = readln.chomp.to!int;
  foreach (_; 0..M) {
    auto s = readln.split;
    auto a = s[0].to!int;;
    auto b = s[1].to!int;
    auto t = s[2].to!real;
    if (a == 0) 
      writefln("%.10f", E^^t);
    else {
      real high = 100;
      real low = 1L;
      foreach (i; 0..50) {
        auto mid = (high + low) / 2.0L;
        if (pow(mid, a) * pow(log(mid), b) >= t)
          high = mid;
        else
          low = mid;
      }
      writefln("%.10f", high);
    }
  }
}