7. Вычислите: $$-9 \cdot (\frac{1}{3}\sqrt{22})^2$$

$$ \begin{aligned} -9 \cdot (\frac{1}{3}\sqrt{22})^2 &= -9 \cdot (\frac{1}{3})^2 \cdot (\sqrt{22})^2 = -9 \cdot \frac{1}{9} \cdot 22 = -1 \cdot 22 = -22 \end{aligned} $$ Ответ: $$\boxed{-22}$$