\[\boxed{\mathbf{2.}\mathbf{180}}\]
Пояснение.
Решение.
\[\textbf{а)}\ \frac{5}{7} - \left( \frac{3}{7} + \frac{3}{14} \right) =\]
\[= \left( \frac{5}{7} - \frac{3}{7} \right) - \frac{3}{14} = \frac{2^{\backslash 2}}{7} - \frac{3}{14} =\]
\[= \frac{4}{14} - \frac{3}{14} = \frac{1}{14}\]
\[\textbf{б)}\ \frac{23}{36} - \left( \frac{1}{30} + \frac{5}{36} \right) =\]
\[= \left( \frac{23}{36} - \frac{5}{36} \right) - \frac{1}{30} = \frac{18}{36} - \frac{1}{30} =\]
\[= \frac{3^{\backslash 5}}{6} - \frac{1}{30} =\]
\[= \frac{15}{30} - \frac{1}{30} = \frac{14}{30} = \frac{7}{15}\]