а) 1) 1 + 2 2/3 = 3 2/3;2) 4/5 - 4/15 = 12/15 - 4/15 = 8/15;3) 3 2/3 : 8/15= 11/3 * 15/8 = 11/1 * 5/8 = 55/8 = 6 7/8,Ответ: 6 7/8.б) 1) 2/3 + 1/12 =8/12 + 1/12 = 9/12 = 3/4;2) 3/4 + 7/24 = 18/24 + 7/24 = 25/24 = 1 1/24;3) 1 1/24 : 50 = 25/24 : 50/1 = 25/24 * 1/50 = 1/24 * 1/2 = 1/48.Ответ: 1/48Задача а)6 : 3/10 = 6/1 * 10/3 = 2/1 * 10/1 = 20/1 = 20 баночек.Ответ: 20 баночек.б) 1) 24 : 2 2/3 = 24/1 : 8/3 = 24/1 * 3/8 = 3/1 * 3/1 = 9 (км/ч);2) 30 : 9 = 3 3/9 = 3 1/3 (ч).Ответ: 3 1/3 ч