4. Найдите значение выражения:
\((\frac{7}{8} - \frac{1}{4}) \cdot (\frac{2}{3} + \frac{1}{6})\)
1) \(\frac{7}{8} - \frac{1}{4} = \frac{7}{8} - \frac{1 \cdot 2}{4 \cdot 2} = \frac{7}{8} - \frac{2}{8} = \frac{5}{8}\)
2) \(\frac{2}{3} + \frac{1}{6} = \frac{2 \cdot 2}{3 \cdot 2} + \frac{1}{6} = \frac{4}{6} + \frac{1}{6} = \frac{5}{6}\)
3) \(\frac{5}{8} \cdot \frac{5}{6} = \frac{5 \cdot 5}{8 \cdot 6} = \frac{25}{48}\)
Ответ: \(\frac{25}{48}\)