Ответ:
- 13 − 9 = 4
- 4 + 7 = 11
- 12 − 4 = 8
- 5 + 6 = 11
- 17 − 9 = 8
- 8 + 4 = 12
- 20 − 10 = 10
- 6 + 9 = 15
- 14 − 7 = 7
- 9 + 5 = 14
- 13 − 8 = 5
- 9 + 7 = 16
- 11 − 6 = 5
- 15 − 9 = 6
- 8 + 7 = 15
- 16 − 9 = 7
- 5 + 5 = 10
- 12 − 6 = 6
- 7 + 7 = 14
- 13 − 6 = 7
- 11 − 10 = 1
- 5 + 6 = 11
- 14 − 6 = 8
- 20 − 19 = 1
- 3 + 8 = 11
- 15 − 8 = 7
