Задание 162

$$\left( \frac{1}{6} - \frac{3}{4} \right) \cdot 18 =$$ $$\left( \frac{2}{12} - \frac{9}{12} \right) \cdot 18 =$$ $$-\frac{7}{12} \cdot 18 =$$ $$-\frac{7 \cdot 18}{12} = -\frac{126}{12} = -10,5$$