Ответ:

  1. \(40 + 5 = 45\)
  2. \(26 + 2 = 28\)
  3. \(76 - 70 = 6\)
  4. \(60 - 40 = 20\)
  5. \(30 + 20 = 50\)
  6. \(70 + 13 = 83\)
  7. \(28 - 8 = 20\)
  8. \(37 - 6 = 31\)