2/3
Пошаговое объяснение:
5/6 + 2 3/4 : 4 8/9 * 2 2/3 - 1 2/3 + (5/38 * 1 1/3 - 10/57) =
5/6 + 3/2 - 5/3 + (10/57 - 10/57) = 7/3 - 5/3 + 0 = 2/3
По действиям:
1. 2 3/4 : 4 8/9 = 11/4 * 9/44 = 9/16
2. 9/16 * 2 2/3 = 9/16 * 8/3 = 3/2
3. 5/38 * 1 1/3 = 5/38 * 4/3 = 10/57
4. 10/57 - 10/57 = 0
5. 5/6 + 3/2 = 14/6 = 7/3
6. 7/3 - 1 2/3 = 7/3 - 5/3 = 2/3
