一、口算。
$\frac{5}{8} ÷ 15 =$
$\frac{4}{5} - \frac{1}{6} =$
$\frac{8}{7} ÷ \frac{4}{7} =$
$\frac{3}{4} + 25\% =$
$1 - 9\% =$
$\frac{3}{7} × \frac{49}{10} =$
$\frac{1}{2} × \frac{3}{8} =$
$\frac{1}{9} ÷ \frac{2}{27} =$
$50\% × 0.54 =$
$\frac{11}{5} ÷ \frac{22}{25} =$
$\frac{9}{11} × \frac{22}{31} =$
$\frac{7}{8} - \frac{2}{7} =$
$15\% × \frac{2}{3} =$
$50\% × \frac{1}{20} =$
$\frac{1}{9} + \frac{3}{5} =$
$\frac{3}{5} × 1.4 =$
$\frac{6}{7} - \frac{1}{3} =$
$\frac{3}{16} × \frac{5}{9} =$
$\frac{16}{19} ÷ \frac{1}{38} =$
$\frac{4}{5} ÷ \frac{2}{15} =$
$80\% ÷ \frac{4}{15} =$

1.$\frac{1}{24}$
2.$\frac{19}{30}$
3.$2$
4.$1$
5.$0.91$
6.$\frac{21}{10}$
7.$\frac{3}{16}$
8.$\frac{3}{2}$
9.$0.27$
10.$\frac{5}{2}$
11.$\frac{18}{31}$
12.$\frac{33}{56}$
13.$\frac{1}{10}$
14.$\frac{1}{40}$
15.$\frac{32}{45}$
16.$\frac{21}{25}$
17.$\frac{11}{21}$
18.$\frac{5}{48}$
19.$32$
20.$6$
21.$3$

二、计算下面各题。
$(\frac{5}{6} - \frac{1}{2}) × (\frac{7}{8} - \frac{3}{4})$
$\frac{1}{2} + (\frac{3}{4} - \frac{1}{12}) × \frac{3}{5}$
$(\frac{1}{3} - \frac{1}{6}) × 80\% ÷ 20\%$
$\frac{4}{5} × (3.2 - 2.99 ÷ 2.3)$
$(\frac{1}{6} + \frac{7}{15}) ÷ \frac{2}{5} + \frac{5}{12}$
$\frac{11}{12} - \frac{1}{4} + \frac{3}{10} ÷ 60\%$

1.$\frac{1}{24}$
2.$\frac{9}{10}$
3.$\frac{2}{3}$
4.$1.52$
5.$2$
6.$\frac{7}{6}$