Ответ:

  1. 11000110₂ = 306₈ = 198₁₀ = C6₁₆.
  2. 304₈ = 11000100₂ = 196₁₀ = C4₁₆.
  3. 200₁₀ = 11001000₂ = 310₈ = C8₁₆.
  4. 7C₁₆ = 01111100₂ = 174₈ = 124₁₀.