3.
[tex] \frac{3}{9} + \frac{4}{9} + \frac{1}{9} = \frac{8}{9} parte \: asfaltata[/tex]
4.
[tex] \frac{3}{7} + \frac{2}{7} = \frac{5}{7} [/tex]
5.
[tex] \frac{2}{8} + \frac{3}{8} = \frac{5}{8} [/tex]
6.
[tex] \frac{1}{10} + \frac{2}{10} + \frac{3}{10} = \frac{6}{10} [/tex]
