Посередине примеры. срочно
97 31/31 - (17 56/60 - 24/60 + 21 27/60 - 38) - 51 7/20 = 98 - (38 59/60 - 38) - 51 7/20 = 98 - 59/60 - 51 7/20 = 97 60/60 - 51 21/60 - 59/60 = 46 36/60 - 59/60 = 45 96/60 - 59/60 = 45 37/60