1. 直接写出得数。（20☆）
$6÷\frac{3}{16}=$
$9÷\frac{3}{11}=$
$16÷\frac{8}{11}=$
$\frac{9}{13}÷\frac{3}{26}=$
$3÷\frac{2}{5}=$
$8÷\frac{4}{3}=$
$5÷\frac{3}{4}=$
$6÷\frac{3}{14}=$
$14÷\frac{7}{25}=$
$\frac{3}{5}÷\frac{1}{25}=$
$\frac{18}{5}÷\frac{9}{20}=$
$\frac{12}{5}÷\frac{8}{5}=$
$4÷\frac{1}{5}=$
$\frac{9}{5}÷\frac{3}{10}=$
$\frac{5}{4}÷\frac{2}{3}=$
$9÷\frac{3}{4}=$
$75÷\frac{1}{4}=$
$\frac{5}{11}÷\frac{1}{2}=$
$\frac{6}{7}÷42=$
$4÷\frac{4}{5}=$

$6÷\frac{3}{16}=32$
$9÷\frac{3}{11}=33$
$16÷\frac{8}{11}=22$
$\frac{9}{13}÷\frac{3}{26}=6$
$3÷\frac{2}{5}=\frac{15}{2}$
$8÷\frac{4}{3}=6$
$5÷\frac{3}{4}=\frac{20}{3}$
$6÷\frac{3}{14}=28$
$14÷\frac{7}{25}=50$
$\frac{3}{5}÷\frac{1}{25}=15$
$\frac{18}{5}÷\frac{9}{20}=8$
$\frac{12}{5}÷\frac{8}{5}=\frac{3}{2}$
$4÷\frac{1}{5}=20$
$\frac{9}{5}÷\frac{3}{10}=6$
$\frac{5}{4}÷\frac{2}{3}=\frac{15}{8}$
$9÷\frac{3}{4}=12$
$75÷\frac{1}{4}=300$
$\frac{5}{11}÷\frac{1}{2}=\frac{10}{11}$
$\frac{6}{7}÷42=\frac{1}{49}$
$4÷\frac{4}{5}=5$

2. 根据乘法算式写出对应的两道除法算式。(12☆)
$\frac{2}{3}×5=\frac{10}{3}\{\begin{array}{l}( )÷( )=( )\\( )÷( )=( )\end{array} $
$\frac{4}{7}×\frac{3}{5}=\frac{12}{35}\{\begin{array}{l}( )÷( )=( )\\( )÷( )=( )\end{array} $

第一组：
$\frac{10}{3}÷5=\frac{2}{3}$
$\frac{10}{3}÷\frac{2}{3}=5$
第二组：
$\frac{12}{35}÷\frac{3}{5}=\frac{4}{7}$
$\frac{12}{35}÷\frac{4}{7}=\frac{3}{5}$

3. 下面的计算对吗？对的画“√”，错的画“×”，并改正。(6☆)
(1) $\frac{4}{15} ÷ \frac{5}{12} = \frac{\overset{1}{\cancel{4}}}{\underset{3}{\cancel{15}}} × \frac{\overset{1}{\cancel{5}}}{\underset{3}{\cancel{12}}} = \frac{1}{9}$ () 改正：
(2) $2.5 ÷ \frac{3}{5} = \frac{\cancel{2.5}}{\underset{0.5}{\cancel{0.5}}} ÷ \frac{\overset{3}{\cancel{3}}}{\underset{1}{\cancel{5}}} = 1.5$ () 改正：

(1) × 改正：$\frac{4}{15}÷\frac{5}{12}=\frac{4}{15}×\frac{12}{5}=\frac{16}{25}$
(2) × 改正：$2.5÷\frac{3}{5}=2.5×\frac{5}{3}=\frac{25}{6}$

4. 计算下面各题。(12☆)
$36÷\frac{9}{7}+\frac{4}{3}÷\frac{5}{6}$
$\frac{3}{10}÷\frac{8}{15}÷\frac{9}{16}$
$(\frac{1}{4}+\frac{1}{7})÷\frac{5}{14}$

$36÷\frac{9}{7}+\frac{4}{3}÷\frac{5}{6}=29\frac{3}{5}$
$\frac{3}{10}÷\frac{8}{15}÷\frac{9}{16}=1$
$(\frac{1}{4}+\frac{1}{7})÷\frac{5}{14}=\frac{11}{10}$