Ответ:

Пошаговое объяснение:

1) = 1. 1/18 * (3. 1/6 + 2. 5/6) = 1. 1/18 * (5. 6/6) =

19/18 * 6 = 19/3 * 1 = 19/3 =

6. 1/3

2) = 1. 1/14 * (4. 7/8 + 2. 1/8) = 1. 1/14 * (6. 8/8) =

15/14 * 7 = 15/2 * 1 = 15/2 =

7. 1/2