в) $$9 \cdot (\frac{2}{9})^3$$

в) $$9 \cdot (\frac{2}{9})^3 = 9 \cdot \frac{2^3}{9^3} = 9 \cdot \frac{8}{729} = \frac{9 \cdot 8}{729} = \frac{72}{729} = \frac{8}{81}$$

Ответ: $$\frac{8}{81}$$