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: \(\frac{271}{343}\).
