Explicație pas cu pas:
[tex] \frac{4}{5} + \frac{2}{5} = \frac{4 + 2}{5} = \frac{6}{5} \\ \frac{4}{6} + \frac{2}{6} - \frac{3}{6} = \frac{4 + 2 - 3}{6} = \frac{3}{6} = \frac{1}{2} [/tex]
[tex] \frac{9}{10} - \frac{7}{10} - \frac{1}{10} = \frac{9 - 7 - 1}{10} = \frac{1}{10} [/tex]
[tex] \frac{3}{5} + \frac{9}{5} - \frac{8}{5} = \frac{3 + 9 - 8}{10} = \frac{4}{10} = \frac{2}{5} [/tex]
[tex]\frac{8}{9} - \frac{3}{9} + \frac{2}{9} - \frac{3}{9} + \frac{4}{9} = \frac{8 - 3 + 2 - 3 + 4}{9} = \frac{8}{9} [/tex]
