B) $$\frac{p}{q} = \frac{l}{k}$$

Переставим члены данной пропорции:

1. $$\frac{p}{l} = \frac{q}{k}$$
2. $$\frac{k}{q} = \frac{l}{p}$$
3. $$\frac{k}{l} = \frac{q}{p}$$
4. $$\frac{l}{p} = \frac{k}{q}$$
5. $$\frac{l}{k} = \frac{p}{q}$$
6. $$\frac{q}{p} = \frac{k}{l}$$
7. $$\frac{q}{k} = \frac{p}{l}$$

Ответ: $$\frac{p}{l} = \frac{q}{k}$$; $$\frac{k}{q} = \frac{l}{p}$$; $$\frac{k}{l} = \frac{q}{p}$$; $$\frac{l}{p} = \frac{k}{q}$$; $$\frac{l}{k} = \frac{p}{q}$$; $$\frac{q}{p} = \frac{k}{l}$$; $$\frac{q}{k} = \frac{p}{l}$$