1. Сократи:
$$ rac{8}{14} = \frac{4}{7} $$
$$ \frac{7}{63} = \frac{1}{9} $$
$$ \frac{30}{84} = \frac{5}{14} $$
$$ \frac{34 \cdot 12}{3 \cdot 7} = \frac{34 \cdot 4}{7} = \frac{136}{7} = 19\frac{3}{7} $$