一、口算。
$\frac{3}{4} - \frac{2}{15} =$
$\frac{3}{8} ÷ \frac{9}{4} =$
$\frac{3}{10} × \frac{5}{16} =$
$1 ÷ \frac{5}{6} =$
$\frac{2}{17} ÷ \frac{6}{17} =$
$\frac{4}{5} × 0.25 =$
$\frac{1}{3} × \frac{3}{10} =$
$\frac{1}{4} ÷ \frac{9}{10} =$
$\frac{5}{6} × \frac{7}{10} =$
$\frac{4}{5} ÷ \frac{2}{3} =$
$\frac{5}{8} × \frac{4}{15} =$
$\frac{5}{3} × \frac{1}{3} =$
$\frac{7}{12} ÷ \frac{3}{4} =$
$\frac{7}{12} - \frac{1}{4} =$
$\frac{3}{4} × \frac{2}{9} =$
$\frac{1}{3} × 7.5 =$
$\frac{10}{7} ÷ \frac{5}{7} =$
$\frac{6}{7} + \frac{5}{21} =$
$\frac{7}{10} × \frac{5}{14} =$
$\frac{9}{25} ÷ 12 =$
$\frac{11}{25} × \frac{10}{33} =$

$\frac{37}{60}$
$\frac{1}{6}$
$\frac{3}{32}$
$\frac{6}{5}$
$\frac{1}{3}$
$\frac{1}{5}$
$\frac{1}{10}$
$\frac{5}{18}$
$\frac{7}{12}$
$\frac{6}{5}$
$\frac{1}{6}$
$\frac{5}{9}$
$\frac{7}{9}$
$\frac{1}{3}$
$\frac{1}{6}$
$\frac{5}{2}$
$2$
$\frac{23}{21}$
$\frac{1}{4}$
$\frac{3}{100}$
$\frac{2}{15}$

二、把表格补充完整。
1.
2.

1. 0.4 0.19 1.2 0.75
0.002 0.625 0.85
$\frac{2}{5}$ $\frac{19}{100}$ $\frac{6}{5}$ $\frac{3}{4}$
$\frac{1}{500}$ $\frac{5}{8}$ $\frac{17}{20}$
2. 308% 60% 8%
157% 0.37 0.6
0.08 0.012 2.1 $\frac{37}{100}$
$\frac{77}{25}$ $\frac{157}{100}$ $\frac{3}{250}$ $\frac{21}{10}$