$\boldsymbol{\frac{1}{4}}$
$\boldsymbol{\frac{9}{7}}$
$\boldsymbol{\frac{11}{30}}$
$\boldsymbol{\frac{1}{2}}$
$\boldsymbol{\frac{1}{8}}$
$\boldsymbol{\frac{2}{9}}$
$=(\frac {4}{9}+\frac {5}{9})+\frac {6}{7}$ = $\frac{13}{7}$
$=\frac {3}{4}-\frac {1}{2}$ = $\frac{1}{4}$
$=(\frac {2}{3}+\frac {1}{3})-(\frac {3}{8}+\frac {5}{8}) $ $=0 $
$=(\frac {13}{7}-\frac {6}{7})-(\frac {4}{5}+\frac {1}{5}) $ $=0 $
$\boldsymbol{1,2,3,4,6,12}$
$\boldsymbol{1,2,3,6,9,18}$
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