Numaratorul este cel de sus
[tex] \frac{4}{n} [/tex]
n<10 => n = 0,1,2,3,4,5,6,7,8,9. Dar nu putem avea 0 la numitor, deci 0 este exclus sin multime.
[tex] \frac{4}{1} \: \frac{4}{2} \: \frac{4}{3} \: \frac{4}{4} \: \frac{4}{5} \: \frac{4}{6} \: \frac{4}{7} \: \frac{4}{8} \: \frac{4}{9} [/tex]
[tex] \frac{4}{1} \: si \: \frac{4}{2} \: si \: \frac{4}{3} \: = > \: supraunitare[/tex]
[tex] \frac{4}{4} = > \: echiunitara[/tex]
[tex] \frac{4}{5} \: \frac{4}{6} \: \frac{4}{7} \: \frac{4}{8} \: \frac{4}{9} \: = > subunitare[/tex]
