Ответ:

  1. 7 + 7 − 14 = 14 − 14 = 0.
  2. (6 + 6) − 10 = 12 − 10 = 2.
  3. 90 − 1 − 80 = 89 − 80 = 9.
  4. 22 − (21 + 1) = 22 − 22 = 0.
  5. 65 − 5 + 40 = 60 + 40 = 100.
  6. 6 + (15 − 7) = 6 + 8 = 14.
  7. 8 + 9 − 1 = 17 − 1 = 16.
  8. 63 − (30 + 30) = 63 − 60 = 3.
  9. 94 + (11 − 10) = 94 + 1 = 95.
  10. 70 + 20 + 9 = 90 + 9 = 99.
  11. 18 − (16 − 8) = 18 − 8 = 10.
  12. 30 − 1 + 0 = 29 + 0 = 29.
  13. (77 − 70) + 9 = 7 + 9 = 16.
  14. (43 + 1) − 40 = 44 − 40 = 4.
  15. 8 + (19 + 1) = 8 + 20 = 28.