9) \(\frac{1}{3}+2\frac{7}{9}\)

\(\frac{1}{3}=\frac{3}{9}\).

\(\frac{1}{3}+2\frac{7}{9}=2+\frac{3}{9}+\frac{7}{9}=2\frac{10}{9}=3\frac{1}{9}\).

Ответ: \(3\frac{1}{9}\).