17 10 5 / 20 34 2 =

\( \frac{17}{20} : \frac{10}{34} : \frac{5}{2} = \frac{17}{20} \times \frac{34}{10} \times \frac{2}{5} = \frac{17 \times 34 \times 2}{20 \times 10 \times 5} = \frac{1156}{1000} = \frac{289}{250} \)

Ответ: \( \frac{289}{250} \)