Ответ:

  1. 9 + 8 − 5 + 4 = 16
  2. 2 + 5 + 8 + 9 = 24
  3. 8 − 3 + 9 − 7 = 7
  4. 4 + 7 + 9 + 4 = 24
  5. 3 + 2 + 6 + 9 = 20
  6. 7 + 6 + 4 + 8 = 25
  7. 5 + 9 + 8 + 4 = 26
  8. 6 + 7 − 2 + 9 = 20
  9. 5 + 4 + 3 + 4 = 16
  10. 6 − 7 + 9 + 8 = 16
  11. 5 + 9 − 3 + 9 = 20
  12. 4 + 2 + 7 + 4 = 17