Ответ:5 + 8 − 10 = 13 − 10 = 3.16 − 8 + 9 = 8 + 9 = 17.56 − 50 + 7 = 6 + 7 = 13.87 − 7 − 20 = 80 − 20 = 60.70 + 6 = 76.80 − 50 = 30.