\[\boxed{\mathbf{2.}\mathbf{156}}\]
Пояснение.
Решение.
\[\textbf{а)}\frac{2^{\backslash 12}}{3} = \frac{24}{36};\ \ \frac{5^{\backslash 6}}{6} = \frac{30}{36};\ \frac{7^{\backslash 4}}{9} =\]
\[= \frac{28}{36};\ \frac{11^{\backslash 3}}{12} = \frac{33}{36}\]
\[В\ порядке\ возрастания:\]
\[\frac{2}{3} < \frac{7}{9} < \frac{5}{6} < \frac{11}{12}.\]
\[\textbf{б)}\ \frac{25^{\backslash 2}}{28} = \frac{50}{56};\ \ \frac{53}{56};\ \frac{7^{\backslash 7}}{8} =\]
\[= \frac{49}{56};\ \ \frac{13^{\backslash 4}}{14} = \frac{52}{56}\]
\[В\ порядке\ возрастания:\]
\[\frac{7}{8} < \frac{25}{28} < \frac{13}{14} < \frac{53}{56}.\]