Ответ:

  1. −88 + 44 = −44.
  2. 67 − (−23) = 67 + 23 = 90.
  3. 9 − 12 = −3.
  4. −4 + 7 = 3.
  5. 25 − 30 = −5.
  6. −14 + 21 = 7.
  7. 75 − 90 = −15.
  8. −56 + 81 = 25.