$\frac{2}{3} = \frac{8}{12}$,
$\frac{5}{6} = \frac{10}{12}$,
$\frac{7}{12}$.
Ответ: $\frac{7}{12} < \frac{2}{3} < \frac{5}{6}$

$-\frac{1}{3} = -\frac{6}{18}$,
$-\frac{5}{6} = -\frac{15}{18}$,
$-\frac{7}{9} = -\frac{14}{18}$.
Ответ: $-\frac{5}{6} < -\frac{7}{9} < -\frac{6}{18}$

$\frac{1}{2} = \frac{4}{8}$,
$\frac{3}{4} = \frac{6}{8}$,
$\frac{5}{8}$.
Ответ: $\frac{1}{2} < \frac{5}{8} < \frac{6}{8}$

$-\frac{5}{12}$,
$-\frac{1}{4} = -\frac{3}{12}$,
$-\frac{1}{6} = -\frac{2}{12}$.
Ответ: $-\frac{5}{12} < -\frac{1}{4} < -\frac{1}{6}$

$\frac{3}{10} = \frac{9}{30}$,
$\frac{2}{5} = \frac{12}{30}$,
$\frac{4}{15} = \frac{8}{30}$.
Ответ: $\frac{4}{15} < \frac{3}{10} < \frac{2}{5}$

$-\frac{7}{10} = -\frac{21}{30}$,
$-\frac{8}{15} = -\frac{16}{30}$,
$-\frac{3}{5} = -\frac{18}{30}$.
Ответ: $-\frac{7}{10} < -\frac{3}{5} < -\frac{8}{15}$