Ответ:

  1. 10001100₂ = 214₈ = 140₁₀ = 8C₁₆.
  2. 205₈ = 10000101₂ = 133₁₀ = 85₁₆.
  3. 155₁₀ = 10011011₂ = 233₈ = 9B₁₆.
  4. 89₁₆ = 10001001₂ = 211₈ = 137₁₀.