Ответ:

  1. 46 + 36 = 82.
  2. 16 + 28 = 44.
  3. 47 + 47 = 94.
  4. 37 + 28 = 65.
  5. 26 + 29 = 55.
  6. 28 + 28 = 56.
  7. 48 + 27 + 19 = 48 + (27 + 19) = 48 + 46 = 94.
  8. 46 + 18 + 28 = 46 + (18 + 28) = 46 + 46 = 92.
  9. 15 + 17 + 32 = 15 + 17 + 32 = 32 + 32 = 64.
  10. 80 : 4 = 20.
  11. 20 × 5 = 100.
  12. 90 : 3 = 30.