[tex]\frac{2}{\boxed{5}} +\frac{1}{\boxed{2}} = 0,9 (\frac{2}{5} +\frac{1}{2} = \frac{4}{10} +\frac{5}{10}= \frac{9}{10} = 0,9)[/tex]
[tex]\frac{\boxed{3}}{15} +\frac{\boxed{3}}{6} = 0,7 (\frac{3}{15} +\frac{3}{6} = \frac{12}{60}+\frac{30}{60} = \frac{42}{60} = \frac{21}{30} = \frac{7}{10} = 0,7[/tex]
[tex]\frac{1}{\boxed{15}} +\frac{\boxed{14}}{15} = 1 ( \frac{1}{15} +\frac{14}{15} =\frac{15}{15} = 1)[/tex]
[tex]\frac{\boxed{4}}{\boxed{10}} +\frac{\boxed{3}}{\boxed{10}} = 0,7. ( \frac{4}{10} +\frac{3}{10} =\frac{7}{10} = 0,7)[/tex]
