г) $$\frac{p-q}{p} \cdot (\frac{p}{p-q} + \frac{p}{q}) = \frac{p-q}{p} \cdot (\frac{pq + p(p-q)}{q(p-q)}) = \frac{p-q}{p} \cdot \frac{pq + p^2 - pq}{q(p-q)} = \frac{p-q}{p} \cdot \frac{p^2}{q(p-q)} = \frac{p}{q}$$
Ответ: $$\frac{p}{q}$$