Сократите дроби: а) 20/118, 236/444, 66/102, 128/28; б) 108/72, 36/243, 120/168, 720/640.

а) \(\frac{20}{118}=\frac{10}{59}\); \(\frac{236}{444}=\frac{59}{111}\); \(\frac{66}{102}=\frac{11}{17}\); \(\frac{128}{28}=\frac{32}{7}\).

б) \(\frac{108}{72}=\frac{3}{2}\); \(\frac{36}{243}=\frac{4}{27}\); \(\frac{120}{168}=\frac{5}{7}\); \(\frac{720}{640}=\frac{9}{8}\).