\[\boxed{\mathbf{2.}\mathbf{155}}\]
Пояснение.
Решение.
\[\textbf{а)}\ \frac{3^{\backslash 3}}{4} = \frac{9}{12} > \frac{7}{12}\]
\[\textbf{б)}\ \frac{4^{\backslash 11}}{9} = \frac{44}{99} < \frac{5^{\backslash 9}}{11} = \frac{45}{99}\]
\[\textbf{в)}\ \frac{3^{\backslash 15}}{5} = \frac{45}{75} < \frac{47}{75}\]
\[\textbf{г)}\ \frac{19}{42} = \frac{19 \cdot 11}{42 \cdot 11} = \frac{209}{462} > \frac{23}{77} =\]
\[= \frac{23 \cdot 6}{77 \cdot 6} = \frac{138}{462}\]