766. Сократите дроби по образцу: ж) 21/56, 144/120, 156/128, 396/240;

\(\frac{21}{56}=\frac{21:7}{56:7}=\frac{3}{8}\); \(\frac{144}{120}=\frac{144:24}{120:24}=\frac{6}{5}\); \(\frac{156}{128}=\frac{156:4}{128:4}=\frac{39}{32}\); \(\frac{396}{240}=\frac{396:12}{240:12}=\frac{33}{20}\).

Ответ: \(\frac{3}{8};\ \frac{6}{5};\ \frac{39}{32};\ \frac{33}{20}\).