Verified answer

Ответ:

1) 4 : 4 4/5 = 4 : 24/5 = 4 * 5/24 = 5/6
2) 2 2/7 * 5 1/4 = 16/7 * 21/4 = 4 * 3 = 12
3) 5/6 + 12 = 12 5/6
4) 12 5/6 - 7 11/12 = 12 10/12 - 7 11/12 = 11 22/12 - 7 11/12 = 4 11/12