б) $$\frac{4}{9} \cdot \frac{6}{11} \cdot 2 \frac{1}{4}$$

Решение: $$\frac{4}{9} \cdot \frac{6}{11} \cdot 2 \frac{1}{4} = \frac{4}{9} \cdot \frac{6}{11} \cdot \frac{9}{4} = \frac{4}{9} \cdot \frac{9}{4} \cdot \frac{6}{11} = 1 \cdot \frac{6}{11} = \frac{6}{11}$$ Ответ: $$\frac{6}{11}$$