1. 直接写出得数。(16☆)
$\frac{2}{5}÷\frac{8}{15}=$
$\frac{9}{38}÷\frac{3}{19}=$
$\frac{25}{27}÷\frac{5}{9}=$
$8÷\frac{4}{15}=$
$\frac{35}{17}÷\frac{5}{34}=$
$\frac{1}{14}÷\frac{9}{7}=$
$\frac{15}{22}÷\frac{45}{88}=$
$\frac{13}{27}÷\frac{13}{3}=$
$\frac{55}{84}÷\frac{33}{42}=$
$\frac{16}{21}÷48=$
$0.5÷\frac{9}{4}=$
$\frac{45}{31}÷\frac{90}{31}=$
$\frac{25}{43}÷\frac{75}{86}=$
$\frac{39}{50}÷\frac{13}{100}=$
$\frac{27}{44}÷\frac{9}{11}=$
$\frac{17}{66}÷\frac{34}{33}=$

1.$\frac{3}{4}$ 2.$\frac{3}{2}$ 3.$\frac{5}{3}$ 4.30 5.14 6.$\frac{1}{18}$ 7.$\frac{4}{3}$ 8.$\frac{1}{9}$ 9.$\frac{5}{6}$ 10.$\frac{1}{63}$ 11.$\frac{2}{9}$ 12.$\frac{1}{2}$ 13.$\frac{2}{3}$ 14.6 15.$\frac{3}{4}$ 16.$\frac{1}{4}$

2. 计算下面各题。(18☆)
$\frac{9}{16}÷\frac{12}{13}÷\frac{7}{16}$
$\frac{14}{33}÷\frac{5}{22}×\frac{10}{7}$
$\frac{7}{18}×\frac{9}{5}÷\frac{14}{25}$
$\frac{45}{32}÷\frac{15}{16}÷\frac{9}{7}$
$\frac{16}{25}÷\frac{8}{15}×\frac{5}{12}$
$\frac{3}{5}×\frac{8}{7}÷\frac{3}{2}$

解：
1. $\dfrac{9}{16}÷\dfrac{12}{13}÷\dfrac{7}{16}$
$=\dfrac{9}{16}×\dfrac{13}{12}×\dfrac{16}{7}$
$=\dfrac{9}{16}×\dfrac{16}{7}×\dfrac{13}{12}$
$=\dfrac{9}{7}×\dfrac{13}{12}$
$=\dfrac{39}{28}$
2. $\dfrac{14}{33}÷\dfrac{5}{22}×\dfrac{10}{7}$
$=\dfrac{14}{33}×\dfrac{22}{5}×\dfrac{10}{7}$
$=\dfrac{28}{15}×\dfrac{10}{7}$
$=\dfrac{8}{3}$
3. $\dfrac{7}{18}×\dfrac{9}{5}÷\dfrac{14}{25}$
$=\dfrac{7}{18}×\dfrac{9}{5}×\dfrac{25}{14}$
$=\dfrac{7}{10}×\dfrac{25}{14}$
$=\dfrac{5}{4}$
4. $\dfrac{45}{32}÷\dfrac{15}{16}÷\dfrac{9}{7}$
$=\dfrac{45}{32}×\dfrac{16}{15}×\dfrac{7}{9}$
$=\dfrac{3}{2}×\dfrac{7}{9}$
$=\dfrac{7}{6}$
5. $\dfrac{16}{25}÷\dfrac{8}{15}×\dfrac{5}{12}$
$=\dfrac{16}{25}×\dfrac{15}{8}×\dfrac{5}{12}$
$=\dfrac{6}{5}×\dfrac{5}{12}$
$=\dfrac{1}{2}$
6. $\dfrac{3}{5}×\dfrac{8}{7}÷\dfrac{3}{2}$
$=\dfrac{3}{5}×\dfrac{8}{7}×\dfrac{2}{3}$
$=\dfrac{3}{5}×\dfrac{2}{3}×\dfrac{8}{7}$
$=\dfrac{2}{5}×\dfrac{8}{7}$
$=\dfrac{16}{35}$

3. 从甲地到乙地共35千米，其中$\frac{4}{7}$是上坡路，$\frac{2}{7}$是下坡路，其余是平路。小明在甲、乙两地往返一趟，共走下坡路多少千米？（9☆）

$35×(\frac{4}{7}+\frac{2}{7})=30$(千米)
答:共走下坡路30千米。