Verified answer

2 целых 5/9 - 1 = 1 целая 5/9 = (1·9+5)/9 = 14/9

7 целых 13/15 - 1 = 6 целых 13/15 = (6·15+13)/15 = 103/15

1 целая 8/9 - 1 = 8/9 - правильная дробь