Ответ:

  1. (a8/b7)−2 = a−16b14 = b14/a16.
  2. (m−4/n−5)−3 = (n5/m4)−3 = m12/n15.
  3. (2x6/(3y−4))2 = (2x6y4/3)2 = 4x12y8/9.
  4. (−4x−5y/z3)3 = −64x−15y3/z9 = −64y3/(x15z9).