1.计算下面各题。
(1)$\frac {4}{11}÷6= $
(2)$\frac {7}{12}÷4= $
(3)$\frac {12}{23}÷8= $

1. (1) $\frac{2}{33}$ (2) $\frac{7}{48}$ (3) $\frac{3}{46}$

2.根据乘法算式写出两道除法算式。
(1)$\frac {3}{4}×5= \frac {15}{4}→\left\{\begin{array}{l} ()÷()= ()\\ ()÷()= ()\end{array} \right. $
(2)$\frac {3}{7}×\frac {2}{5}= \frac {6}{35}→\left\{\begin{array}{l} ()÷()= ()\\ ()÷()= ()\end{array} \right. $
(3)$\frac {7}{9}×\frac {5}{6}= \frac {35}{54}→\left\{\begin{array}{l} ()÷()= ()\\ ()÷()= ()\end{array} \right. $

2.
(1) $\begin{cases} \frac{15}{4} ÷ 5 = \frac{3}{4} \\ \frac{15}{4} ÷ \frac{3}{4} = 5 \end{cases}$
(2) $\begin{cases} \frac{6}{35} ÷ \frac{2}{5} = \frac{3}{7} \\ \frac{6}{35} ÷ \frac{3}{7} = \frac{2}{5} \end{cases}$
(3) $\begin{cases} \frac{35}{54} ÷ \frac{5}{6} = \frac{7}{9} \\ \frac{35}{54} ÷ \frac{7}{9} = \frac{5}{6} \end{cases}$