Ответ:

  1. 8 + 7 - 10 = 15 - 10 = 5
  2. 7 + 7 - 10 = 14 - 10 = 4
  3. 12 - 4 + 9 = 8 + 9 = 17
  4. 14 - 9 + 7 = 5 + 7 = 12
  5. 17 - 10 + 9 = 7 + 9 = 16
  6. 14 - 6 + 5 = 8 + 5 = 13