8. \(4\frac{3}{5}-2\frac{4}{5}\)

\[4\frac{3}{5}-2\frac{4}{5}=\frac{23}{5}-\frac{14}{5}=\frac{9}{5}=1\frac{4}{5}.\]

Ответ: \(1\frac{4}{5}\).