import strutils, sequtils, math, strscans

proc printf(formatstr: cstring) {.header: "<stdio.h>", importc: "printf", varargs.}

proc f(n, a, b : float64): float64 {.inline.} = pow(n, a) * pow(ln(n), b)

when isMainModule:
  var
    m: int
    input = stdin.readLine
    a, b, t, l, r: float64
  discard input.scanf("$i", m)

  var memo = newSeq[float64](100001)

  for i in 0..m-1:
    (l, r) = (0.0, 1000000000.0)
    input = stdin.readLine
    discard input.scanf("$f $f $f", a, b, t)

    for i in 1..64:
      var mid = (l + r) / 2
      if f(mid, a, b) <= t: l = mid
      else: r = mid
    printf("%.11f\n", r)