Ответ:8 + 3 − 9 = 11 − 9 = 2.10 + 5 − 2 = 15 − 2 = 13.15 − 10 + 3 = 5 + 3 = 8.13 − 3 + 4 = 10 + 4 = 14.7 + 11 − 6 = 18 − 6 = 12.9 + 12 − 5 = 21 − 5 = 16.