Решение

а) $$4\frac{1}{6} \cdot 3\frac{3}{5} = \frac{25}{6} \cdot \frac{18}{5} = \frac{5}{1} \cdot \frac{3}{1} = 15$$

б) $$1\frac{2}{13}:1\frac{4}{11} = \frac{15}{13}:\frac{15}{11} = \frac{15}{13} \cdot \frac{11}{15} = \frac{1}{13} \cdot \frac{11}{1} = \frac{11}{13}$$

в) $$2\frac{2}{3} \cdot 1\frac{1}{8}:6\frac{2}{3} = \frac{8}{3} \cdot \frac{9}{8}:\frac{20}{3} = \frac{8}{3} \cdot \frac{9}{8} \cdot \frac{3}{20} = \frac{1}{1} \cdot \frac{3}{1} \cdot \frac{3}{20} = \frac{9}{20}$$

Ответ:

a) 15

б) $$\frac{11}{13}$$

в) $$\frac{9}{20}$$