import std.algorithm.iteration;
import std.conv;
import std.math;
import std.stdio;
import std.string;


const real EPS = 1e-9;


// https://ja.wikipedia.org/wiki/ランベルトのW関数
T lambertW(T)(T z, T tol=EPS, int iter=1000){
	T xi = 1.0f;
	T xj;
	foreach (i; 0 .. iter){
		xj = xi - (xi * exp(xi) - z) / (exp(xi) + xi * exp(xi));
		if (approxEqual(xi, xj, EPS)){
			return xj;
		}
		xi = xj;
	}
	throw new Exception("Failure: No convergence");
}


T solveEquation(T)(T a, T b, T t, T tol=EPS){
	if (approxEqual(a, 0, EPS)){
		return exp(pow(t, 1 / b));
	} else if (approxEqual(b, 0, EPS)) {
		return pow(t, 1 / a);
	} else {
		return exp(b / a * lambertW(a / b * pow(t, 1 / b)));
	}
}


void main(){
	auto m = readln.chomp.to!int;
	foreach (i; 0..m) {
		auto s = readln.split.map!(to!real);
		auto res = solveEquation(s[0], s[1], s[2]);
		writefln("%.11f\n", res);
	}
}