import Control.Monad (replicateM_)
import Text.Printf (printf)

newton :: Double -> Double -> Double -> Double -> Double -> Double
newton a b t n d
    | abs d > 10e-10 = newton a b t n' d'
    | otherwise      = n'
    where
        t1 = log n
        t2 = n ** (a - 1.0)
        t3 = t1 ** (b - 1.0)
        d' = (t2 * n * t3 * t1 - t) / (t2 * t3 * (a * t1 + b))
        n' = n - d'

solve :: Double -> Double -> Double -> Double
solve a b t
    | a == 0.0  = exp (t ** (1.0 / b))
    | b == 0.0  = t ** (1.0 / a)
    | otherwise = newton a b t 2.0 114514

main = do
    m <- readLn
    replicateM_ m $ do
        [a, b, t] <- map read . words <$> getLine
        printf "%.10f\n" $ solve a b t