Ответ:17 + 3 = 20.14 + 5 = 19.11 + 8 = 19.13 + 6 = 19.15 + 5 = 20.18 − 9 + 4 = 9 + 4 = 13.15 + 5 − 12 = 20 − 12 = 8.12 − 8 + 13 = 4 + 13 = 17.11 − 9 + 11 = 2 + 11 = 13.17 − 7 + 9 = 10 + 9 = 19.