4 8 20 5 10 2

\[ \frac{4}{5} \div \frac{8}{10} \div \frac{20}{2} = \frac{4}{5} \cdot \frac{10}{8} \cdot \frac{2}{20} = \frac{4 \cdot 10 \cdot 2}{5 \cdot 8 \cdot 20} = \frac{80}{800} = \frac{1}{10} \]

Ответ: \(\frac{1}{10}\)