Tính: 5-2/3

\(5 - \frac{2}{3} = \frac{{15}}{3} - \frac{2}{3} = \frac{{13}}{3}\)

\(\frac{{12}}{7} - 1 = \frac{{12}}{7} - \frac{7}{7} = \frac{5}{7}\)

\(\frac{3}{7} + 2 = \frac{3}{7} + \frac{{14}}{7} = \frac{{17}}{7}\)

\(3 + \frac{5}{9} = \frac{{27}}{9} + \frac{5}{9} = \frac{{32}}{9}\)