Explicație pas cu pas:
[tex] \frac{1}{2} + \frac{1}{2} = \frac{2}{2} \\ \frac{3}{2} - \frac{1}{2} = \frac{2}{2} [/tex]
[tex] \frac{1}{3} + \frac{1}{3} = \frac{2}{3} \\ \frac{3 }{3} - \frac{1}{3} = \frac{2}{3} [/tex]
[tex] \frac{1}{5} + \frac{2}{5} = \frac{3}{5} \\ \frac{4}{5} - \frac{1}{5} = \frac{3}{5} [/tex]
[tex] \frac{1}{7} + \frac{3}{7} = \frac{4}{7} \\ \frac{6}{7} - \frac{2}{7} = \frac{4}{7} [/tex]
[tex]\frac{2}{8} + \frac{3}{8} = \frac{5}{8} \\ \frac{7}{8} - \frac{2}{8} = \frac{5}{8}[/tex]
[tex] \frac{1}{6} + \frac{3}{6} = \frac{4}{6} \\ \frac{7}{6} - \frac{3}{6} = \frac{4}{6} [/tex]
