Решите,пожалуйста!!!!​

9 11/12 - 3 10/12 = 6 1/12
11 - 5/18= 10 18/18 - 5/18 = 10 13/18
8 3/17 - 4 11/17 = 7 20/17 - 4 11/17 = 3 9/17
9 11/15 - 4 = 5 11/15
21 - 8 7/15 = 12 + 8 15/15 - 8 7/15 = 12 8/15
10 15/16 - 3 15/16 = 7