Răspuns :
[tex]\frac{1}{2} + \frac{3}{2} + \frac{5}{2} =\frac{9}{2}[/tex]
[tex]\frac{3}{13} + \frac{7}{13} +\frac{5}{13} = \frac{15}{13}[/tex]
[tex]\frac{70}{25} + \frac{10}{25} +\frac{20}{25 } = \frac{100}{25}[/tex]
[tex]\frac{1}{2} + \frac{3}{2} + \frac{5}{2} =\frac{9}{2}[/tex]
[tex]\frac{3}{13} + \frac{7}{13} +\frac{5}{13} = \frac{15}{13}[/tex]
[tex]\frac{70}{25} + \frac{10}{25} +\frac{20}{25 } = \frac{100}{25}[/tex]