Ответ:а) 2 1/3 + 1 2/3 = 3 + 3/3 = 4.б) 1 4/5 + 3 3/5 = 4 + 7/5 = 5 2/5.в) 2 1/6 + 1 5/12 = 3 + 2/12 + 5/12 = 3 7/12.г) 3 1/7 + 1 5/14 = 4 + 2/14 + 5/14 = 4 1/2.