3. Упростите выражение $$3 \frac{1}{2}x - \frac{1}{6}x + 1 \frac{1}{3}x$$
$$3 \frac{1}{2} = \frac{3 \cdot 2 + 1}{2} = \frac{7}{2}$$ $$1 \frac{1}{3} = \frac{1 \cdot 3 + 1}{3} = \frac{4}{3}$$ $$\frac{7}{2}x - \frac{1}{6}x + \frac{4}{3}x = \frac{7 \cdot 3}{2 \cdot 3}x - \frac{1}{6}x + \frac{4 \cdot 2}{3 \cdot 2}x = \frac{21}{6}x - \frac{1}{6}x + \frac{8}{6}x = \frac{21 - 1 + 8}{6}x = \frac{28}{6}x = \frac{14}{3}x = 4 \frac{2}{3}x$$
Ответ: $$4 \frac{2}{3}x$$