8) \(10\frac{6}{7}-1\frac{3}{14}\)

\(\frac{6}{7}=\frac{12}{14}\).

\(10\frac{6}{7}-1\frac{3}{14}=9+\frac{12}{14}-\frac{3}{14}=9\frac{9}{14}\).

Ответ: \(9\frac{9}{14}\).