3) 5-k p+10 5p 5k

3) $$\frac{5-k}{5p} - \frac{p+10}{5k} = \frac{k(5-k)}{5pk} - \frac{p(p+10)}{5pk} = \frac{5k - k^2 - p^2 - 10p}{5pk}$$

Ответ: $$\frac{5k - k^2 - p^2 - 10p}{5pk}$$