一、口算。
$\frac{15}{16} ÷ \frac{5}{8} =$
$\frac{3}{22} × 0.44 =$
$10 ÷ \frac{5}{7} =$
$\frac{6}{7} ÷ \frac{3}{5} =$
$5 - \frac{3}{4} =$
$\frac{1}{2} ÷ \frac{2}{5} =$
$12 ÷ \frac{3}{4} =$
$\frac{2}{3} × \frac{1}{2} =$
$\frac{4}{5} - \frac{1}{2} =$
$\frac{5}{6} × \frac{7}{8} =$
$20 ÷ \frac{5}{6} =$
$\frac{5}{6} + \frac{4}{9} =$
$\frac{5}{13} × \frac{13}{15} =$
$\frac{7}{8} ÷ \frac{1}{16} =$
$\frac{4}{9} × 18 =$
$\frac{8}{9} × \frac{3}{4} =$
$1.25 × \frac{8}{5} =$
$\frac{9}{4} ÷ \frac{3}{4} =$
$\frac{4}{9} ÷ \frac{2}{3} =$
$\frac{2}{7} + \frac{5}{8} =$
$\frac{10}{21} × \frac{7}{15} =$

$\frac{3}{2}$
$\frac{3}{50}$
14
$\frac{10}{7}$
$4\frac{1}{4}$
$\frac{5}{4}$
16
$\frac{1}{3}$
$\frac{3}{10}$
$\frac{35}{48}$
24
$\frac{23}{18}$
$\frac{1}{3}$
14
8
$\frac{2}{3}$
2
3
$\frac{2}{3}$
$\frac{51}{56}$
$\frac{2}{9}$

二、计算下面各题，能用简便算法的就用简便算法。
$\frac{8}{7} - ( \frac{1}{9} - \frac{1}{12} ) × 3.6$
$\frac{7}{13} × \frac{4}{5} + \frac{6}{13} ÷ \frac{5}{4}$
$( 2.5 + \frac{5}{8} + \frac{5}{12} ) ÷ 5$
$\frac{5}{8} ÷ ( \frac{3}{4} + \frac{1}{3} ) × \frac{4}{5}$
$\frac{13}{4} × \frac{5}{8} - \frac{5}{4} ÷ \frac{8}{5}$
$1 - \frac{14}{25} ÷ \frac{4}{5} - \frac{3}{10}$

$\frac{73}{70}$
$\frac{4}{5}$
$\frac{17}{24}$
$\frac{6}{13}$
$\frac{5}{4}$
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