б) $$\frac{5}{9} : \frac{1}{2} = \frac{5}{9} \cdot \frac{2}{1} = \frac{5 \cdot 2}{9 \cdot 1} = \frac{10}{9} = 1\frac{1}{9}$$
Ответ: $$1\frac{1}{9}$$