Вопрос:

45. Вычислите: \(\frac{25}{12}:1\frac{7}{8}-\frac{3}{5}\cdot(4-2\frac{11}{18})\).

Ответ:

\(1\frac{7}{8}=\frac{15}{8}\), \(4-2\frac{11}{18}=\frac{25}{18}\).

\(\frac{25}{12}:\frac{15}{8}=\frac{25}{12}\cdot\frac{8}{15}=\frac{10}{9}\).

\(\frac{3}{5}\cdot\frac{25}{18}=\frac{5}{6}\).

\(\frac{10}{9}-\frac{5}{6}=\frac{20-15}{18}=\frac{5}{18}\).

Ответ: \(\frac{5}{18}\).