Ответ:
1) 10 35/36
2) 3 1/5
3) 3 1/30
Пошаговое объяснение:
1) 19 5/6 - 6 1/12 - 2 7/9 = 19 30/36 - 6 3/36 - 2 28/36 = 13 27/36 - 2 28/36 = 12 63/36 - 2 28/36 = 10 35/36
2) 11 7/10 - 5 7/30 - 3 4/15 = 11 21/30 - 5 7/30 - 3 8/30 = 6 14/30 - 3 8/30 = 3 6/30 = 3 1/5
3) 9 14/15 - 2 1/5 - 4 7/10 = 9 28/30 = 2 6/30 - 4 21/30 = 7 22/30 - 4 21/30 = 3 1/30