А) 9 2/3 + 1 1/4 = 8/12 + 3/12 = 10 11/12;
Б) 4 2/3 + 7 4/5 = 10/15 + 12/15 = 11 22/15;
В) 2 3/10 + 6 1/9 = 27/90 + 10/90 = 8 37/90;
Г) 13 1/5 + 4 2/7 = 7/35 + 10/35 = 17 17/35;
Д) 7 3/20 + 8 4/5 = 3/20 + 16/20 = 15 19/20;
Е) 2 7/48 + 11 77/96 = 14/96 + 77/96 = 13 91/96.