1. 直接写出得数。
实际用时：分钟
$\frac{3}{10}×5=$
$\frac{2}{7}×2=$
$\frac{1}{9}×\frac{3}{7}=$
$\frac{1}{20}×\frac{2}{3}=$
$8÷\frac{1}{4}=$
$\frac{2}{5}÷2=$
$\frac{3}{4}÷\frac{4}{3}=$
$\frac{7}{24}÷\frac{1}{3}=$
$\frac{1}{5}÷5=$
$\frac{1}{2}÷3=$
$\frac{5}{8}÷5=$
$\frac{2}{9}÷8=$
$\frac{3}{4}÷2=$
$\frac{2}{7}÷4=$
$\frac{3}{5}÷9=$
$\frac{5}{6}÷15=$
$\frac{14}{3}×\frac{3}{4}=$
$0.79×\frac{25}{79}=$
$\frac{7}{10}×\frac{12}{7}=$
$\frac{45}{91}×\frac{7}{15}=$
$\frac{13}{32}×\frac{8}{39}=$
$\frac{40}{81}×\frac{9}{10}=$
$5.1×\frac{11}{17}=$
$\frac{7}{99}×\frac{8}{7}=$
$\frac{3}{4}÷\frac{9}{10}=$
$\frac{3}{7}÷6=$
$\frac{4}{5}×\frac{5}{4}=$
$\frac{5}{8}÷\frac{5}{6}=$
$\frac{2}{15}÷\frac{8}{25}=$
$\frac{4}{5}÷\frac{8}{9}=$
$\frac{3}{10}×\frac{5}{9}=$
$\frac{1}{3}-\frac{1}{7}=$
$\frac{5}{7}÷\frac{3}{4}=$
$\frac{5}{14}÷\frac{5}{14}=$
$\frac{1}{3}÷\frac{1}{99}=$
$\frac{1}{8}÷\frac{5}{2}=$
$\frac{1}{3}÷\frac{1}{12}=$
$\frac{13}{14}÷\frac{16}{35}=$
$\frac{6}{7}÷\frac{48}{49}=$
$\frac{1}{4}+\frac{5}{8}=$

1. $\frac{3}{2}$ $\frac{4}{7}$ $\frac{1}{21}$ $\frac{1}{30}$
$32$ $\frac{1}{5}$ $\frac{9}{16}$ $\frac{7}{8}$
$\frac{1}{25}$ $\frac{1}{6}$ $\frac{1}{8}$ $\frac{1}{36}$
$\frac{3}{8}$ $\frac{1}{14}$ $\frac{1}{15}$ $\frac{1}{18}$
$\frac{7}{2}$ $\frac{1}{4}$ $\frac{6}{5}$ $\frac{3}{13}$
$\frac{1}{12}$ $\frac{4}{9}$ $\frac{33}{10}$ $\frac{8}{99}$
$\frac{5}{6}$ $\frac{1}{14}$ $1$ $\frac{1}{6}$
$\frac{5}{6}$ $\frac{4}{21}$ $\frac{20}{21}$ $1$
$33$ $\frac{1}{20}$ $4$ $\frac{65}{32}$
$\frac{7}{8}$ $\frac{7}{8}$

2. 计算下面各题。
$\frac{7}{10} - \frac{2}{5} + \frac{1}{4}$
$\frac{13}{15} - ( \frac{2}{3} - \frac{2}{5} )$
$\frac{5}{8} × \frac{4}{9} + \frac{5}{8} × \frac{5}{9}$
$\frac{23}{16} - \frac{3}{11} - \frac{7}{16}$
$\frac{4}{21} + \frac{5}{9} + \frac{4}{9} + \frac{5}{21}$
$\frac{5}{7} - \frac{5}{8} + \frac{2}{7} - \frac{1}{8}$

2. $\frac{11}{20}$ $\frac{3}{5}$ $\frac{5}{8}$
$\frac{8}{11}$ $\frac{10}{7}$ $\frac{1}{4}$