Ответ:19 + 51 = 19 + 50 + 1 = 69 + 1 = 70.80 − 35 = 80 − 30 − 5 = 50 − 5 = 45.40 − 17 = 40 − 10 − 7 = 30 − 7 = 23.36 + 24 = 36 + 20 + 4 = 56 + 4 = 60.Ответ: 70; 45; 23; 60.