Ответ:

  1. 3 + 9 = 12
  2. 8 + 4 = 12
  3. 13 − 8 = 5
  4. 14 − 5 = 9
  5. 6 + 8 = 14
  6. 17 − 9 = 8
  7. 14 − 9 = 5
  8. 15 − 6 = 9
  9. 5 + 6 = 11