1. 在〇里填上＞、＜或=。
$\frac{2}{5} ÷ \frac{2}{3}$__$\frac{2}{5} × \frac{2}{3}$ $\frac{9}{11} ÷ 3$__$\frac{9}{11} × 3$
$1 ÷ \frac{3}{2}$__$1 × \frac{3}{2}$ $\frac{2}{3} ÷ 4$__$\frac{2}{3} × 4$

>
<
<
<
$​\frac {5}{3}​$
$​\frac {1}{12}​$
40
$​\frac {1}{16}​$
$​\frac {5}{6}​$
$​\frac {4}{3}​$
$​\frac {8}{15}​$
$​\frac {5}{4}​$
$​\frac {10}{9}​$
$​\frac {2}{3}​$

2. $24 ÷ \frac{3}{5} = 24 × (　　　)$ $\frac{3}{4} ÷ 12 = \frac{3}{4} × (　　　)$
$=(　　　)$ $=(　　　)$
$\frac{5}{6} ÷ \frac{3}{4} = (　　　) × (　　　)$ $\frac{8}{15} ÷ \frac{4}{5} = (　　　) × (　　　)$
$=(　　　)$ $=(　　　)$

3. 计算。
$\frac{2}{3} ÷ \frac{3}{4}$ $\frac{4}{9} ÷ \frac{2}{3}$ $\frac{7}{8} ÷ \frac{7}{16}$
$\frac{8}{9} ÷ \frac{20}{81}$ $12 ÷ \frac{1}{13}$ $15 ÷ 25$

$​=\frac {2}{3}×\frac {4}{3}​$
$​=\frac {8}{9}​$
$​=\frac {4}{9}×\frac {3}{2}​$
$​=\frac {2}{3}​$
$​=\frac {7}{8}×\frac {16}{7}​$
​=2​
$​=\frac {8}{9}×\frac {21}{20}​$
$​=\frac {18}{5}​$
=12×13
=156
$​=15×\frac 1{25}​$
$​=\frac 35​$

4. 解方程。
$8x = \frac{2}{5}$ $\frac{1}{3}x = \frac{7}{12}$ $\frac{5}{6}x = 15$ $\frac{5}{14}x = 5$

$\begin {aligned}$解：$ \frac {5}{6}x&=15\\x &=18\end {aligned}$
$\begin {aligned}$解：$ \frac {5}{14}x&=5\\x &=14\end {aligned}$
$\begin {aligned}$解：$8x&=\frac {2}{5}\\x &=\frac {1}{20}\end {aligned}$
$\begin {aligned}$解：$ \frac {1}{3}x&=\frac {7}{12}\\x &=\frac {7}{4}\end {aligned}$