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

double W(double y) {
	double x = 1.0;
	while (1) {
		double tmp = y - x * exp(x);
		if (fabs(tmp) < 10e-10) return x;
		else x += tmp / 8.0;
	}
}

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 ans = exp(b / a * W(-(a * pow(-t, 1.0 / b) / b)));
		printf("%.10lf\n", ans);
	}

	return 0;
}