Ответ:

  1. \(20 + 8 + 60 + 2 = (20 + 60) + (8 + 2) = 80 + 10 = 90\).
  2. \(40 + 1 + 9 + 50 = (40 + 50) + (1 + 9) = 90 + 10 = 100\).
  3. \(70 + 10 + 16 = 80 + 16 = 96\).
  4. \(20 + 5 + 5 + 30 = (20 + 30) + (5 + 5) = 50 + 10 = 60\).

Ответ: 90; 100; 96; 60.