А)9 2/3+1 1/4 б)13 1/5+4 2/7 в)2 3/10+6 1/9 г)4 2/3+7 4/5 д)7 3/20+8 4/5 е)2 7/48+11 77/96

а) 9 2/3 + 1 1/4 = 29/3 + 5/4 = 116/12 + 15/12 = 131/12 = 10 11/12;

б) 13 1/5 + 4 2/7 = 66/5 + 30/7 = 462/35 + 150/35 = 612/35 = 17 17/35;

в) 2 3/10 + 6 1/9 = 23/10 + 55/9 = 207/90 + 550/90 = 757/90 = 8 37/90;

г) 4 2/3 + 7 4/5 = 14/3 + 39/5 = 70/15 + 117/15 = 187/15 = 12 7/15;

д) 7 3/20 + 8 4/5 = 143/20 + 44/5 = 143/20 + 176/20 = 319/20 = 15 19/20;

е) 2 7/48 + 11 77/96 = 103/48 + 1133/96 = 206/96 + 1133/96 = 1339/96 = 13 91/96.