Ответ:

7/12

Пошаговое объяснение:

1) 2 2/7 * 2 11/12 = 16/7 * 35/12 = 4/1 * 5/3 = 20/3 = 6 2/3

2) 8 - 6 2/3 = 7 3/3 - 6 2/3 = = 1 1/3

3) 1 1/3 : 2 2/7 = 4/3 : 16/7 = 4/3 * 7/16 = 1/3 * 7/4 = 7/12