import sys
import math

def main():
    input = sys.stdin.read().split()
    m = int(input[0])
    idx = 1
    for _ in range(m):
        a = int(input[idx])
        b = int(input[idx+1])
        t = float(input[idx+2])
        idx += 3
        
        if a == 0:
            exponent = t ** (1.0 / b)
            n = math.exp(exponent)
        elif b == 0:
            n = t ** (1.0 / a)
        else:
            C = math.log(t)
            y = 1.0
            for _ in range(50):
                if y <= 0:
                    y = 1e-12
                f = a * y + b * math.log(y) - C
                df = a + b / y
                if abs(f) < 1e-13:
                    break
                delta = f / df
                y -= delta
                if y < 1e-12:
                    y = 1e-12
            n = math.exp(y)
        print("{0:.12f}".format(n))
        
if __name__ == "__main__":
    main()