8) 3/8 : 2 1/4

$$
\frac{3}{8} : 2\frac{1}{4} = \frac{3}{8} : \frac{9}{4} = \frac{3}{8} \cdot \frac{4}{9} = \frac{3 \cdot 4}{8 \cdot 9} = \frac{12}{72} = \frac{1}{6}
$$

Ответ: 1/6