#define _CRT_SECURE_NO_WARNINGS
#include<sstream>
#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<climits>
#include<cmath>
#include<string>
#include<vector>
#include<set>
#include<map>
#include<queue>
#include<numeric>
#include<functional>
#include<algorithm>
#include<bitset>
#include<tuple>
#include<unordered_set>
#include<unordered_map>
#include<random>
#include<cassert>
using namespace std;
#define INF (1<<29)
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define all(v) v.begin(),v.end()
#define uniq(v) v.erase(unique(all(v)),v.end())


int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);

	int m;
	cin >> m;
	rep(i, m) {
		double a, b, t;
		cin >> a >> b >> t;

		if (a == 0) {
			printf("%.12f\n", exp(pow(t, 1 / b)));
		}
		else if (b == 0) {
			printf("%.12f\n", pow(t, 1 / a));
		}
		else {
			double x = 10;
			rep(j, 20) {
				if (x < 1e-10)break;
				double s, t;
				s = pow(x, a);
				t = pow(log(x), b);

				x = x - (s*t - t)
					/ (a*pow(x, a - 1) * t + s*b*pow(log(x), b - 1) / x);
			}
			printf("%.12f\n", x);
		}
	}

	return 0;
}