Ответ:

  1. 1001₂ = 1 × 23 + 0 × 22 + 0 × 21 + 1 × 20 = 8 + 1 = 9.
  2. 13₈ = 1 × 81 + 3 × 80 = 8 + 3 = 11.
  3. A₁₆ = 10 × 160 = 10.
  4. 8₁₀ = 8.

Ответ: 1001₂ = 9; 13₈ = 11; A₁₆ = 10; 8₁₀ = 8.