$\frac{1}{6}和\frac{3}{10}$
$ \begin{aligned} \frac{1}{6}&=\frac{5}{30} \\ \frac{3}{10}&=\frac{9}{30} \\ \end{aligned}$
$\frac{1}{6}＜\frac{3}{10}$
$\frac{2}{9}和\frac{3}{11}$
$ \begin{aligned} \frac{2}{9}&=\frac{22}{99} \\ \frac{3}{11}&= \frac{27}{99} \\ \end{aligned}$
$\frac{2}{9}＜\frac{3}{11}$
$\frac{5}{8}和\frac{7}{12}$
$ \begin{aligned} \frac{5}{8}&=\frac{15}{24} \\ \frac{7}{12}&=\frac{14}{24} \\ \end{aligned}$
$\frac{5}{8}＞\frac{7}{12}$
$\frac{3}{4}，\frac{6}{7}和\frac{7}{8}$
$ \begin{aligned} \frac{3}{4}&= \frac{42}{56} \\ \frac{6}{7}&=\frac{48}{56} \\ \frac{7}{8}&=\frac{49}{56} \\ \end{aligned}$
$ \frac{3}{4}＜\frac{6}{7}＜\frac{7}{8}$
