Ответ:9 + 8 = 17.17 − 8 = 9.17 − 9 = 8.6 + 7 − 5 = 13 − 5 = 8.8 − 4 + 9 = 4 + 9 = 13.3 + 7 + 7 = 10 + 7 = 17.