Ответ:

Сравним дроби: \(\frac{1}{2}=\frac{15}{30}\), \(\frac{17}{30}=\frac{17}{30}\), \(\frac{2}{3}=\frac{20}{30}\), \(\frac{9}{10}=\frac{27}{30}\).

Ответ: \(\frac{1}{2};\ \frac{17}{30};\ \frac{2}{3};\ \frac{9}{10}\).