1. 直接写出得数。
$\frac{5}{7} ÷ 5 =$
$1.5 × \frac{3}{5} =$
$30\% × 6 =$
$\frac{8}{9} - \frac{8}{9} × \frac{3}{8} =$
$\frac{1}{4} + 0.2 =$
$\frac{2}{3} ÷ \frac{1}{9} =$
$\frac{2}{5} ÷ \frac{4}{7} =$
$\frac{7}{11} × \frac{1}{9} × 0 =$
$\frac{5}{24} ÷ \frac{5}{6} =$
$14 ÷ \frac{7}{10} =$
$\frac{2}{3} ÷ 2 =$
$\frac{1}{4} + \frac{3}{4} × \frac{1}{3} =$
$5.2 ÷ 10\% =$
$0.8 × \frac{7}{8} =$
$1 - 42\% =$
$\frac{4}{5} - \frac{1}{2} =$

$\frac{5}{7} ÷ 5 = \frac{1}{7}$
$1.5 × \frac{3}{5} = 0.9$
$30\% × 6 = 1.8$
$\frac{8}{9} - \frac{8}{9} × \frac{3}{8} = \frac{5}{9}$
$\frac{1}{4} + 0.2 = 0.45$
$\frac{2}{3} ÷ \frac{1}{9} = 6$
$\frac{2}{5} ÷ \frac{4}{7} = \frac{7}{10}$
$\frac{7}{11} × \frac{1}{9} × 0 = 0$
$\frac{5}{24} ÷ \frac{5}{6} = \frac{1}{4}$
$14 ÷ \frac{7}{10} = 20$
$\frac{2}{3} ÷ 2 = \frac{1}{3}$
$\frac{1}{4} + \frac{3}{4} × \frac{1}{3} = \frac{1}{2}$
$5.2 ÷ 10\% = 52$
$0.8 × \frac{7}{8} = 0.7$
$1 - 42\% = 0.58$
$\frac{4}{5} - \frac{1}{2} = \frac{3}{10}$

2. 连一连。

左半区连线对应：
$\frac{3}{4}×8 = 6$，和 $4÷\frac{2}{3}=6$ 相连
$0.5×16 = 8$，和 $6÷\frac{3}{4}=8$ 相连
$\frac{4}{7}×\frac{21}{16} = \frac{3}{4}$，和 $\frac{9}{16}÷\frac{3}{4}=\frac{3}{4}$ 相连
$\frac{3}{5}×\frac{10}{3} = 2$，和 $\frac{8}{7}÷\frac{4}{7}=2$ 相连
右半区连线对应：
$\frac{5}{12}×\frac{24}{25} = \frac{2}{5}$，和 $\frac{4}{15}÷\frac{2}{3}=\frac{2}{5}$ 相连
$\frac{9}{10}×\frac{5}{18} = \frac{1}{4}$，和 $\frac{1}{8}÷\frac{1}{2}=\frac{1}{4}$ 相连
$\frac{3}{8}×\frac{16}{9} = \frac{2}{3}$，和 $\frac{4}{3}÷2=\frac{2}{3}$ 相连
$\frac{3}{8}×\frac{4}{3} = \frac{1}{2}$，和 $\frac{5}{14}÷\frac{5}{7}=\frac{1}{2}$ 相连

3.计算下面各题。
$26÷ \dfrac{11}{25}÷ \dfrac{25}{22}$
$\dfrac{12}{17}× 18$
$\dfrac{8}{13}× \dfrac{4}{5}+\dfrac{8}{13}÷ 5$
李叔叔驾车以60千米/时的速度从A地去往B地，行驶到全程的$\dfrac{2}{5}$时，离终点还有30 km。行驶完全程一共需要多少小时？
反思 我错了（）道题。
自我评价：

$26÷ \dfrac{11}{25}÷ \dfrac{25}{22}$
$=26× \dfrac{25}{11}× \dfrac{22}{25}$
$=26× (\dfrac{25}{11}× \dfrac{22}{25})$
$=26× 2$
$=52$
$\dfrac{12}{17}× 18$
$=\dfrac{12}{17}× (17+1)$
$=\dfrac{12}{17}× 17 + \dfrac{12}{17}× 1$
$=12+\dfrac{12}{17}$
$=12\dfrac{12}{17}$
$\dfrac{8}{13}× \dfrac{4}{5}+\dfrac{8}{13}÷ 5$
$=\dfrac{8}{13}× \dfrac{4}{5}+\dfrac{8}{13}× \dfrac{1}{5}$
$=\dfrac{8}{13}× (\dfrac{4}{5}+\dfrac{1}{5})$
$=\dfrac{8}{13}× 1$
$=\dfrac{8}{13}$
$30÷ (1-\dfrac{2}{5})=50$（千米）
$50÷ 60=\dfrac{5}{6}$（小时）
答：行驶完全程一共需要$\dfrac{5}{6}$小时。