Решение:

1. a) $$(\frac{3}{16} + \frac{1}{4}) \cdot 8 = (\frac{3}{16} + \frac{4}{16}) \cdot 8 = \frac{7}{16} \cdot 8 = \frac{7}{2} = 3\frac{1}{2}$$

2. б) $$(\frac{7}{8} - \frac{5}{24}) \cdot 48 = (\frac{21}{24} - \frac{5}{24}) \cdot 48 = \frac{16}{24} \cdot 48 = \frac{2}{3} \cdot 48 = 32$$

3. д) $$(\frac{4}{15} - \frac{1}{5}) \cdot 25 = (\frac{4}{15} - \frac{3}{15}) \cdot 25 = \frac{1}{15} \cdot 25 = \frac{25}{15} = \frac{5}{3} = 1\frac{2}{3}$$

4. б) $$(\frac{5}{9} + \frac{2}{3}) : 11 = (\frac{5}{9} + \frac{6}{9}) : 11 = \frac{11}{9} : 11 = \frac{1}{9}$$

5. г) $$(\frac{9}{13} - \frac{9}{39}) : 9 = (\frac{27}{39} - \frac{9}{39}) : 9 = \frac{18}{39} : 9 = \frac{18}{39} \cdot \frac{1}{9} = \frac{2}{39} \cdot \frac{1}{1} = \frac{2}{39}$$

6. e) $$(\frac{7}{12} + \frac{5}{36}) : 13 = (\frac{21}{36} + \frac{5}{36}) : 13 = \frac{26}{36} : 13 = \frac{13}{18} \cdot \frac{1}{13} = \frac{1}{18}$$