2. Compute 3/4 ÷ (5/6 + 1/4).

\[\frac{3}{4} \div \left(\frac{5}{6} + \frac{1}{4}\right) = \frac{3}{4} \div \frac{29}{12} = \frac{3}{4} \cdot \frac{12}{29} = \frac{36}{116} = \frac{9}{29}\]. Ответ: \(\frac{9}{29}\).