Verified answer

(3 5/7 - 2 9/14) · 1 2/5 : (2 1/12 + 1 1/6) = 6/13

1) 3 5/7 - 2 9/14 = 3 10/14 - 2 9/14 = 1 1/14

2) 2 1/12 + 1 1/6 = 2 1/12 + 1 2/12 = 3 3/12 = 3 1/4

3) 1 1/14 · 1 2/5 = 15/14 · 7/5 = (3·1)/(2·1) = 3/2 = 1 1/2

4) 1 1/2 : 3 1/4 = 3/2 : 13/4 = 3/2 · 4/13 = (3·2)/(1·13) = 6/13

Ответ: 6/13.