4 5\14+(5 1\12-3 4\12)=

4 5/14 + ( 5 1/12 - 3 4/12 ) = 7 6/7

5 1/12 - 3 4/12 = 4 - 3 + 13/12 - 4/12 = 1 9/12 = 1 3/4

4 5/14 + 1 3/4 = 4+1 + 10/28 + 70/28 = 5 80/28 = 7 24/28 = 7 12/14 = 7 6/7

1) 5 1/2 - 3 4/12= 5 6/12 - 3 4/12 = 2 2/12

2) 4 5/14 + 2 2/12 = 4 60/168 + 2 28/168 = 6 88/168

ОТВЕТ : 6 88/168 = 6 11/21

(Могу ошибатся)