Выполнить действия: 1) (8 11/12 − 6 5/12) : 5/8; 2) 2 3/4 : (1 1/2 − 2/5) + (3/4 + 5/6) : 3 1/6.

1) \(8\frac{11}{12}-6\frac{5}{12}=2\frac{6}{12}=\frac{5}{2}\).

\(\frac{5}{2}:\frac{5}{8}=\frac{5}{2}\cdot\frac{8}{5}=4\).

2) \(1\frac{1}{2}-\frac{2}{5}=\frac{3}{2}-\frac{2}{5}=\frac{11}{10}\).

\(2\frac{3}{4}:\frac{11}{10}=\frac{11}{4}\cdot\frac{10}{11}=\frac{5}{2}\).

\(\frac{3}{4}+\frac{5}{6}=\frac{19}{12}\), \(3\frac{1}{6}=\frac{19}{6}\).

\(\frac{19}{12}:\frac{19}{6}=\frac{1}{2}\).

\(\frac{5}{2}+\frac{1}{2}=3\).

Ответ: 1) 4; 2) 3.