2) \( (2\frac{7}{12} + 6\frac{8}{9}) - (5 - \frac{7}{36} - 3\frac{1}{3}) = \)

Решение:

1. \( 2\frac{7}{12} + 6\frac{8}{9} = \frac{31}{12} + \frac{62}{9} = \frac{93 + 248}{36} = \frac{341}{36} \)
2. \( 5 - \frac{7}{36} - 3\frac{1}{3} = 5 - \frac{7}{36} - \frac{10}{3} = \frac{180 - 7 - 120}{36} = \frac{53}{36} \)
3. \( \frac{341}{36} - \frac{53}{36} = \frac{288}{36} = 8 \)

Ответ: 8.