Сложите дроби: а)3/5+13/45 б) 9/10+15/14 в) 9/16+11/24. г) 7/48+77/96

3/5  +  13/45 =(3 × 9  +  13 × 1)/45 = 27/45  +  13/45 =  40/45 = 8/9
9/10  +  15/14 =(9 × 7 + 15 × 5)/70 = 63/70 + 75/70 =  138/70 = 69/35 = 1 34/35
9/16  +  11/24 =   (9 × 3  +  11 × 2)/48 = 27/48  +  22/48 =  49/48 = 1 1/48
7/48  +  77/96 =  (7 × 2  +  77 × 1)/96 = 14/96  +  77/96 =  91/96