1. Сократите: а) 8/14; б) 7/63; в) 30/84.

1. \(\frac{8}{14}=\frac{8\div2}{14\div2}=\frac{4}{7}\).
2. \(\frac{7}{63}=\frac{7\div7}{63\div7}=\frac{1}{9}\).
3. \(\frac{30}{84}=\frac{30\div6}{84\div6}=\frac{5}{14}\).

Ответ: а) \(\frac{4}{7}\); б) \(\frac{1}{9}\); в) \(\frac{5}{14}\).