一、口算。
$18÷\frac{6}{5}=$ $\frac{2}{3}÷\frac{4}{7}=$ $\frac{11}{15}÷\frac{33}{5}=$
$\frac{3}{8}÷\frac{3}{7}=$ $\frac{8}{5}÷\frac{4}{9}=$ $36÷\frac{9}{4}=$
$\frac{7}{10}÷14=$ $\frac{3}{10}÷\frac{3}{5}=$ $\frac{16}{25}÷\frac{4}{5}=$
$\frac{15}{8}÷\frac{3}{4}=$ $\frac{4}{3}÷\frac{1}{3}=$ $\frac{11}{12}÷\frac{22}{3}=$
$\frac{3}{5}÷\frac{9}{4}=$ $\frac{1}{9}÷\frac{3}{4}=$ $\frac{15}{7}÷\frac{5}{7}=$
$\frac{9}{10}÷\frac{3}{11}=$ $\frac{6}{7}÷\frac{3}{14}=$ $12÷\frac{3}{4}=$
$\frac{12}{5}÷\frac{6}{7}=$ $\frac{39}{25}÷\frac{13}{15}=$ $\frac{8}{7}÷\frac{2}{3}=$

1.$15$ 2.$\frac{7}{6}$ 3.$\frac{1}{9}$ 4.$\frac{7}{8}$ 5.$\frac{18}{5}$ 6.$16$ 7.$\frac{1}{20}$ 8.$\frac{1}{2}$ 9.$\frac{4}{5}$ 10.$\frac{5}{2}$ 11.$4$ 12.$\frac{1}{8}$ 13.$\frac{4}{15}$ 14.$\frac{4}{27}$ 15.$3$ 16.$\frac{33}{10}$ 17.$4$ 18.$16$ 19.$\frac{14}{5}$ 20.$\frac{9}{5}$ 21.$\frac{12}{7}$

二、计算下面各题，能用简便算法的就用简便算法。
$\frac{3}{4} ÷ \frac{2}{5} ÷ \frac{9}{4}$
$\frac{3}{5} + \frac{4}{9} ÷ \frac{2}{3} + \frac{2}{5}$
$( \frac{7}{12} - \frac{3}{16} + \frac{5}{32} ) ÷ \frac{1}{96}$
$\frac{5}{2} ÷ ( \frac{5}{8} + \frac{1}{6} )$
$\frac{7}{8} ÷ \frac{4}{11} + \frac{11}{4} ÷ \frac{8}{9}$
$\frac{9}{4} × ( \frac{5}{8} ÷ \frac{15}{56} ) ÷ \frac{7}{2}$

1.$\frac{5}{6}$ 2.$1\frac{2}{3}$ 3.$53$ 4.$\frac{60}{19}$ 5.$\frac{11}{2}$ 6.$\frac{3}{2}$