a) \(\frac{2}{15} \cdot 3\) \(\frac{\frac{9}{25} \cdot 2\frac{1}{7} \cdot 1\frac{5}{9}}{}\)

a) $$ \frac{2}{15} \cdot 3 = \frac{2 \cdot 3}{15} = \frac{6}{15} = \frac{2}{5} $$

$$ \frac{9}{25} \cdot 2\frac{1}{7} \cdot 1\frac{5}{9} = \frac{9}{25} \cdot \frac{15}{7} \cdot \frac{14}{9} = \frac{9 \cdot 15 \cdot 14}{25 \cdot 7 \cdot 9} = \frac{15 \cdot 14}{25 \cdot 7} = \frac{3 \cdot 2}{5} = \frac{6}{5} = 1\frac{1}{5} $$

Ответ: $$\frac{2}{5}; 1\frac{1}{5}$$