Simplify the following expressions: 12. 1/2 * z - 1/6 * z

Решение:

1. \[ \frac{1}{2} z - \frac{1}{6} z = \left( \frac{1}{2} - \frac{1}{6} \right) z = \left( \frac{3}{6} - \frac{1}{6} \right) z = \frac{3-1}{6} z = \frac{2}{6} z = \frac{1}{3} z \]

Ответ: \(\frac{1}{3}z\)