$$\frac{85}{68} = \frac{5 \cdot 17}{4 \cdot 17} = \frac{5}{4} = 1,25$$
$$\frac{17}{625} = \frac{17}{5^4} = \frac{17 \cdot 2^4}{5^4 \cdot 2^4} = \frac{17 \cdot 16}{10^4} = \frac{272}{10000} = 0,0272$$
Ответ: 0,5; 1,25; 0,0272