5) - 9/32 : 18

5) $$- \frac{9}{32} : 18 = - \frac{9}{32} \cdot \frac{1}{18} = - \frac{9 \cdot 1}{32 \cdot 18} = - \frac{1}{32 \cdot 2} = - \frac{1}{64}$$.

Ответ: $$- \frac{1}{64}$$