1.107 Найдите значение выражения:

a) $$3\frac{8}{13} - \frac{5}{13} + (1\frac{5}{39} - \frac{1}{13}) = \frac{47}{13} - \frac{5}{13} + (\frac{44}{39} - \frac{3}{39}) = \frac{42}{13} + \frac{41}{39} = \frac{126}{39} + \frac{41}{39} = \frac{167}{39}$$.
б) $$(1\frac{2}{3} - \frac{1}{6})^2 \cdot 2\frac{1}{3} : \frac{5}{6} = (\frac{5}{3} - \frac{1}{6})^2 \cdot \frac{7}{3} : \frac{5}{6} = (\frac{10}{6} - \frac{1}{6})^2 \cdot \frac{7}{3} \cdot \frac{6}{5} = (\frac{9}{6})^2 \cdot \frac{14}{5} = (\frac{3}{2})^2 \cdot \frac{14}{5} = \frac{9}{4} \cdot \frac{14}{5} = \frac{9 \cdot 7}{2 \cdot 5} = \frac{63}{10} = 6.3$$.