Ответ:7 + 8 = 15.6 + 7 = 13.13 − 7 = 6.16 + 2 = 18.17 − 11 = 6.13 + 4 = 17.8 + 2 − 9 = 10 − 9 = 1.19 − 9 + 1 = 10 + 1 = 11.2 + 5 + 3 = 7 + 3 = 10.