1) 4 - 7/9 = 4 - 0.7777... = 3.2222...

2) 9 целых 7/12 = 9 + 7/12 = 9 + 0.5833... = 9.5833...

3) 8 - 3 целых 7/13 = 8 - 3 - 7/13 = 5 - 0.5384... = 4.4615...