a) $$\frac{14p^{4}}{q^{6}} \cdot \frac{q^{5}}{56p^{4}}$$;

a) $$\frac{14p^{4}}{q^{6}} \cdot \frac{q^{5}}{56p^{4}} = \frac{14p^{4}q^{5}}{56p^{4}q^{6}} = \frac{14}{56} \cdot \frac{p^{4}}{p^{4}} \cdot \frac{q^{5}}{q^{6}} = \frac{1}{4} \cdot 1 \cdot \frac{1}{q} = \frac{1}{4q}$$.

Ответ: $$\frac{1}{4q}$$