Ответ:

  1. 5⁻³ + 10⁻² = 1/125 + 1/100 = 4/500 + 5/500 = 9/500.
  2. (3/8)⁻¹ + 3⁻² − (−2,6)⁰ = 8/3 + 1/9 − 1 = 24/9 + 1/9 − 9/9 = 16/9.
  3. (2/3)⁻³ · 9⁻² = (3/2)³ · 1/9² = 27/8 · 1/81 = 1/24.