1. 直接写出得数。
实际用时：分钟
$\frac{5}{9}÷\frac{3}{5}=$
$\frac{7}{8}÷21=$
$\frac{6}{11}÷\frac{1}{2}=$
$\frac{3}{7}÷\frac{1}{4}=$
$\frac{14}{15}÷\frac{7}{10}=$
$\frac{7}{15}×\frac{3}{35}=$
$\frac{2}{3}÷\frac{20}{21}=$
$10÷\frac{5}{4}=$
$\frac{4}{5}÷\frac{10}{13}=$
$\frac{2}{9}÷\frac{1}{3}=$
$\frac{4}{15}×\frac{2}{5}=$
$\frac{2}{7}÷\frac{15}{7}=$
$\frac{3}{8}÷\frac{1}{4}=$
$5÷\frac{4}{5}=$
$\frac{9}{16}÷\frac{3}{4}=$
$\frac{1}{4}×\frac{8}{9}=$
$\frac{2}{3}÷3=$
$\frac{7}{8}×2=$
$\frac{7}{15}÷\frac{7}{9}=$
$\frac{6}{5}÷\frac{3}{5}=$
$\frac{1}{4}÷\frac{3}{8}=$
$\frac{4}{9}÷\frac{2}{3}=$
$\frac{8}{3}÷\frac{4}{3}=$
$\frac{7}{20}×\frac{5}{14}=$
$\frac{11}{2}÷\frac{5}{3}=$
$\frac{1}{12}÷\frac{5}{8}=$
$\frac{1}{10}×5=$
$\frac{1}{4}×\frac{1}{3}=$
$\frac{7}{9}÷\frac{1}{10}=$
$\frac{4}{15}÷\frac{4}{5}=$
$\frac{3}{4}×\frac{4}{3}=$
$\frac{5}{8}÷\frac{1}{4}=$
$\frac{1}{6}÷\frac{2}{3}=$
$35÷\frac{7}{15}=$
$\frac{5}{8}÷\frac{6}{7}=$
$\frac{5}{8}÷\frac{3}{4}=$
$\frac{5}{6}÷\frac{2}{3}=$
$\frac{4}{15}÷\frac{2}{3}=$
$\frac{5}{8}÷\frac{1}{4}=$
$\frac{7}{3}÷\frac{8}{3}=$

1. $\frac{25}{27}$ $\frac{1}{24}$ $\frac{12}{11}$ $\frac{12}{7}$
$\frac{4}{3}$ $\frac{1}{25}$ $\frac{7}{10}$ $8$
$\frac{26}{25}$ $\frac{2}{3}$ $\frac{8}{75}$ $\frac{2}{15}$
$\frac{3}{2}$ $\frac{25}{4}$ $\frac{3}{4}$ $\frac{2}{9}$
$\frac{2}{9}$ $\frac{7}{4}$ $\frac{3}{5}$ $2$
$\frac{2}{3}$ $\frac{2}{3}$ $2$ $\frac{1}{8}$
$\frac{33}{10}$ $\frac{2}{15}$ $\frac{1}{2}$ $\frac{1}{12}$
$\frac{70}{9}$ $\frac{1}{3}$ $1$ $\frac{5}{2}$
$\frac{1}{4}$ $75$ $\frac{35}{48}$ $\frac{5}{6}$
$\frac{5}{4}$ $\frac{2}{5}$ $\frac{5}{2}$ $\frac{7}{8}$

2. 计算下面各题。
$1+\dfrac{1}{3}-\dfrac{2}{9}$
$\dfrac{5}{9}+(\dfrac{4}{9}-\dfrac{3}{10})$
$(\dfrac{5}{11}+\dfrac{3}{7})+(\dfrac{4}{7}+\dfrac{6}{11})$

$\dfrac{8}{35}+\dfrac{3}{35}+\dfrac{4}{35}$
$\dfrac{19}{20}-(\dfrac{3}{20}+\dfrac{9}{20})$

2. $\frac{10}{9}$ $\frac{7}{10}$ $2$
$\frac{1}{18}$ $\frac{3}{7}$ $\frac{7}{20}$