Ответ:

  1. 52 − 51 = 1
  2. 10 : 2 = 5
  3. 64 − 26 = 38
  4. 18 + 72 = 90
  5. 31 + 53 = 84
  6. 80 − 30 = 50
  7. 10 · 3 = 30
  8. 77 − 24 = 53
  9. 43 + 46 = 89
  10. 41 − 30 = 11