(+)

$$\left(\frac{1}{2} - \frac{1}{3}\right) \cdot \left(\frac{1}{4} + \frac{1}{5}\right)$$

1. $$\frac{1}{2} - \frac{1}{3} = \frac{3-2}{6} = \frac{1}{6}$$


2. $$\frac{1}{4} + \frac{1}{5} = \frac{5+4}{20} = \frac{9}{20}$$


3. $$\frac{1}{6} \cdot \frac{9}{20} = \frac{9}{120} = \frac{3}{40}$$

Ответ: 3/40