Respostas

2016-06-25T15:40:07-03:00
\begin{array}{r|l|l} 72&2&1\\ 36&2&2\\ 
18&2&4\\ 9&3&8\\ 3&3&3,\,6,\,12,\,24\\ 
1&&9,\,18,\,36,\,72 \end{array}\\\\\\ 
\mathrm{D}(72)=\{1,\,2,\,3,\,4,\,6,\,8,\,9,\,12,\,18,\,24,\,36,\,72\}


Destes divisores, os que estão entre 10 e 30 são:

\{12,\,18,\,24\}


Bons estudos! :-)