Вопрос:

Вычислите: \(\frac{5}{6}-\frac{25}{49}\cdot\left(3-1\frac{13}{14}\right)+\frac12\).

Ответ:

\(3-1\frac{13}{14}=\frac{42}{14}-\frac{27}{14}=\frac{15}{14}\).

\(\frac{25}{49}\cdot\frac{15}{14}=\frac{375}{686}\).

\(\frac56+\frac12-\frac{375}{686}=\frac43-\frac{375}{686}=\frac{917}{686}-\frac{375}{686}=\frac{542}{686}=\frac{271}{343}\).

Ответ: \(\frac{271}{343}\).