Ответ:

  1. 14 − 7 + 6 = 7 + 6 = 13.

  2. 23 − 20 + 60 = 3 + 60 = 63.

  3. 36 − 6 + 20 = 30 + 20 = 50.

  4. 15 − 8 − 5 = 7 − 5 = 2.

  5. 45 − 40 + 7 = 5 + 7 = 12.

  6. 54 − 50 + 9 = 4 + 9 = 13.