Ответ:

  1. 90 − 60 = 30
  2. 60 + 30 = 90
  3. 48 − 40 = 8
  4. 57 − 8 = 49
  5. 100 − 90 = 10
  6. 20 + 9 = 29
  7. 35 − 5 = 30
  8. 22 + 7 = 29
  9. 92 + 8 = 100
  10. 41 + 9 = 50