Ответ:

  1. \(8 + 4 + 0 = 12\).
  2. \(8 + 8 - 6 = 16 - 6 = 10\).
  3. \(6 + 3 - 5 = 9 - 5 = 4\).
  4. \(60 + 30 - 50 = 90 - 50 = 40\).
  5. \(45 - 5 + 1 = 40 + 1 = 41\).
  6. \(30 - 10 + 5 = 20 + 5 = 25\).

Ответ: 12; 10; 4; 40; 41; 25.