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


const real EPS = 1e-9;


T lambertW(T)(T x, T tol=EPS) {
	auto f = (T t) => t * exp(t) - x;
	return findRoot(f, -1.0f, 10f);
}


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);
	}
}