\[\boxed{\mathbf{2.2}\mathbf{97}}\]
\[\textbf{а)}\frac{3^{\backslash 2}}{7} - \frac{1}{14} = \frac{6}{14} - \frac{1}{14} = \frac{5}{14}\]
\[\frac{3^{\backslash 2}}{7} + \frac{1}{14} = \frac{6}{14} + \frac{1}{14} = \frac{7}{14}\]
\[\frac{5}{14} + \frac{7}{14} = \frac{12}{14} = \frac{6}{7}\]
\[Ответ:\ \frac{6}{7}.\]
\[\textbf{б)}\ \frac{1^{\backslash 4}}{9} - \frac{1^{\backslash 3}}{12} = \frac{4}{36} - \frac{3}{36} = \frac{1}{36}\]
\[\frac{1^{\backslash 4}}{9} + \frac{1^{\backslash 3}}{12} = \frac{4}{36} + \frac{3}{36} = \frac{7}{36}\]
\[\frac{1}{36} + \frac{7}{36} = \frac{8}{36} = \frac{2}{9}\]
\[Ответ:\ \frac{2}{9}.\]
\[Так\ будет\ проще\ и\ быстрее\ \]
\[получить\ ответ:\]