#include <stdio.h>
#include <math.h>

int main() {
	int m;
	scanf("%d", &m);

	double a, b, t, ans;
	int i;

	for (i = 0; i < m; i++) {
		scanf("%lf %lf %lf", &a, &b, &t);

		if (a == 0) ans = exp(pow(t, 1.0 / b));
		else if (b == 0) ans = pow(t, 1.0 / a);
		else {
			double n = 1.0;
			double tmp1 = pow(t, 1.0 / b);
			double tmp2 = a / b;

			while (1) {
				double tmp3 = n - exp(tmp1 / pow(n, tmp2));

				if (fabs(tmp3) <= 10e-10) {
					ans = n;
					break;
				}
				else n -= tmp3 / 4.0;
			}
		}
		printf("%.10lf\n", ans);
	}

	return 0;
}