import strutils, sequtils, math, strscans

proc scanf(frmt: cstring) {.varargs, importc, header: "<stdio.h>".}
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
    a, b, t: float64
  scanf("%ld", addr m)

  for i in 0..m-1:
    scanf("%lf %lf %lf", addr a, addr b, addr t)
    var
      l = 0.0
      r = 1000000000.0

    for p in 1..100:
      var mid = (l + r) / 2
      if f(mid, a, b) <= t: l = mid
      else: r = mid

    printf("%.11f\n", r)