3) $$10 \cdot \left(\frac{1}{5}\right)^2 - 12 \cdot \frac{1}{5}$$

• $$10 \cdot \frac{1}{25} - \frac{12}{5}$$
• $$\frac{10}{25} - \frac{12}{5}$$
• $$\frac{2}{5} - \frac{12}{5}$$
• $$-\frac{10}{5}$$
• $$-2$$

Ответ: -2