一、口算。
$80\% - \frac{3}{8} =$
$\frac{9}{11} ÷ 3 =$
$(3 + \frac{3}{20}) × 5 =$
$\frac{11}{14} × \frac{3}{22} =$
$\frac{5}{6} - \frac{4}{5} =$
$10 ÷ \frac{2}{3} × 150\% =$
$20\% ÷ \frac{2}{9} =$
$4.22 + 80\% =$
$\frac{3}{4} + \frac{1}{2} ÷ \frac{1}{2} =$
$\frac{7}{10} ÷ \frac{4}{5} =$
$25\% - \frac{1}{5} =$
$6 ÷ (\frac{1}{2} - \frac{1}{3}) =$
$\frac{3}{16} × \frac{32}{9} =$
$24 ÷ \frac{3}{4} =$
$48 × (\frac{1}{4} - \frac{1}{6}) =$
$\frac{3}{5} + \frac{1}{3} =$
$30\% × 0.5 =$
$\frac{4}{3} × 4 ÷ \frac{4}{3} =$
$\frac{5}{11} × 33 =$
$\frac{3}{10} + \frac{1}{6} =$
$81\% ÷ \frac{3}{10} × \frac{5}{9} =$

1.$\frac{17}{40}$ 2.$\frac{3}{11}$ 3.$\frac{63}{4}$ 4.$\frac{3}{28}$ 5.$\frac{1}{30}$ 6.$22.5$ 7.$0.9$ 8.$5.02$ 9.$\frac{7}{4}$ 10.$\frac{7}{8}$ 11.$\frac{1}{20}$ 12.$36$ 13.$\frac{2}{3}$ 14.$32$ 15.$4$ 16.$\frac{14}{15}$ 17.$0.15$ 18.$4$ 19.$15$ 20.$\frac{7}{15}$ 21.$1.5$

二、计算下面各题，能用简便算法的就用简便算法。
$\frac{25}{36}×\frac{5}{6}+\frac{11}{36}÷\frac{6}{5}$
$\frac{4}{9}×(1-\frac{1}{4})÷\frac{1}{36}$
$\frac{3}{4}×87+12×75\%+0.75$
$\frac{1}{6}+\frac{5}{3}×80\%+\frac{5}{6}$
$(\frac{1}{2}-\frac{1}{6})×60\%÷\frac{1}{5}$
$\frac{1}{6}÷[\frac{9}{17}×(\frac{3}{4}+\frac{2}{3})]$

1.$\frac{5}{6}$ 2.$12$ 3.$75$ 4.$\frac{7}{3}$ 5.$1$ 6.$\frac{2}{9}$