1. Сократите: \(\frac{8}{14};\ \frac{7}{63};\ \frac{30}{84};\ \frac{34\cdot12}{3\cdot17}\).

\(\frac{8}{14}=\frac{4}{7}\); \(\frac{7}{63}=\frac{1}{9}\); \(\frac{30}{84}=\frac{5}{14}\); \(\frac{34\cdot12}{3\cdot17}=\frac{34\cdot4}{17}=8\).

Ответ: \(\frac47;\ \frac19;\ \frac5{14};\ 8\).