Ответ:

  1. 30 + 18 − 21 = 48 − 21 = 27
  2. 80 − 56 + 16 = 24 + 16 = 40
  3. 92 − 72 + 26 = 20 + 26 = 46
  4. 43 + 17 + 40 = 60 + 40 = 100
  5. 100 − 24 + 6 = 76 + 6 = 82
  6. 38 + 30 − 16 = 68 − 16 = 52
  7. 34 + 36 − 19 = 70 − 19 = 51
  8. 90 − 73 + 18 = 17 + 18 = 35