помогите с примером!!!​

Ответ:

(2/7 + 3 1/4) - (11/14 + 13/28) = 2 2/7

1) 2/7 + 3 1/4 = 8/28 + 3 7/28 = 3 15/28

2) 11/14 + 13/28 = 22/28 + 13/28 = 35/28 = 1 7/28 = 1 1/4

3) 3 15/28 - 1 1/4 = 3 15/28 - 1 7/28 = 2 8/28 = 2 2/7