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