31 16/35 + 14 17/21 = 31 48/105 + 14 85/105 = 45 133/105 = 46 целых 28/105
23 9/20 - 15 13/15 = 23 27/60 - 15 52/60 = 22 87/60 - 15 52/60 = 7 35/60 = 7 целых 7/12
31 16/35 + 14 17/21 = 31 48/105 + 14 85/105 = 45 133/105 = 46 целых 28/105
23 9/20 - 15 13/15 = 23 27/60 - 15 52/60 = 22 87/60 - 15 52/60 = 7 35/60 = 7 целых 7/12