Вычислите: \((\frac{1}{18}+\frac{1}{27}):\frac{5}{9}\); \((4,7+1,6):0,3\).

1. \(\left(\frac{1}{18}+\frac{1}{27}\right):\frac{5}{9}=\left(\frac{3}{54}+\frac{2}{54}\right)\cdot\frac{9}{5}=\frac{5}{54}\cdot\frac{9}{5}=\frac{1}{6}\).
2. \((4,7+1,6):0,3=6,3:0,3=21\).

Ответ: \(\frac{1}{6};\ 21\).