а) $$ \frac{14p^4}{q^6} : \frac{56p^4}{q^5} = \frac{14p^4}{q^6} \cdot \frac{q^5}{56p^4} = \frac{14p^4q^5}{56p^4q^6} = \frac{14 \cdot p^4 \cdot q^5}{14 \cdot 4 \cdot p^4 \cdot q^5 \cdot q} = \frac{1}{4q} $$
Ответ: $$ \frac{1}{4q} $$