57. Сократите дроби: а) 6/10, 6/18, 9/15, 9/24; б) 2/12, 3/15, 30/6, 7/42; в) 12/60, 99/22, 5/100, 20/1000.

Сокращаем числитель и знаменатель на их общий делитель.

1. а) \(\frac{6}{10}=\frac{3}{5}\), \(\frac{6}{18}=\frac{1}{3}\), \(\frac{9}{15}=\frac{3}{5}\), \(\frac{9}{24}=\frac{3}{8}\).
2. б) \(\frac{2}{12}=\frac{1}{6}\), \(\frac{3}{15}=\frac{1}{5}\), \(\frac{30}{6}=5\), \(\frac{7}{42}=\frac{1}{6}\).
3. в) \(\frac{12}{60}=\frac{1}{5}\), \(\frac{99}{22}=\frac{9}{2}\), \(\frac{5}{100}=\frac{1}{20}\), \(\frac{20}{1000}=\frac{1}{50}\).