7-3/4
9 - 12/15
11-5/6
7-3/11
​

Ответ:

Пошаговое объяснение:

7-3/4 = 6 4/4 - 3/4 = 6 1/4;

9 - 12/15 = 8 15/15 - 12/15 = 8 3/15 = 8 1/5;

11-5/6 = 10 6/6 - 5/6 = 10 1/6;

7-3/11 = 6 11/11 - 3/11 = 6 8/11.