Ответ:

  1. 45 − 9 + 8 = 36 + 8 = 44.

  2. 21 − 4 + 3 = 17 + 3 = 20.

  3. 56 − 8 + 3 = 48 + 3 = 51.

  4. 37 − 8 + 4 = 29 + 4 = 33.

  5. 72 − 6 + 4 = 66 + 4 = 70.

  6. 42 − 5 + 7 = 37 + 7 = 44.