Ответ:
Пошаговое объяснение:
3 5/6 + 1/6 = 3 + (5/6 + 1/6) = 3 + 6/6 = 3 + 1 = 4
15 3/8 + 4 2/8 = (15 + 4) + (3/8 + 2/8) = 19 + 5/8 = 19 5/8
7/11 + 3 2/11 = 3 + (7/11 + 2/11) = 3 + 9/11 = 3 9/11
9 3/10 + 4 1/10 = (9 + 4) + (3/10 + 1/10) = 13 + 4/10 = 13 4/10 = 13 2/5
17 5/12 + 1 7/12 = (17 + 1) + (5/12 + 7/12) = 18 + 12/12 = 18 + 1 = 19
1/9 + 9 8/9 = 9 + (1/9 + 8/9) = 9 + 9/9 = 9 + 1 = 10