1. 直接写出得数。
实际用时：分钟
$\frac{8}{9}×\frac{9}{8}=$
$\frac{8}{9}÷\frac{1}{8}=$
$10÷\frac{2}{5}=$
$\frac{5}{6}÷\frac{5}{7}=$
$\frac{6}{11}×\frac{7}{9}=$
$10÷\frac{1}{25}=$
$12÷\frac{6}{7}=$
$1÷\frac{2}{9}=$
$\frac{8}{5}×\frac{5}{16}=$
$\frac{7}{16}÷\frac{5}{12}=$
$14÷\frac{2}{7}=$
$\frac{1}{3}÷\frac{3}{2}=$
$24×\frac{5}{12}=$
$\frac{13}{33}÷\frac{9}{22}=$
$16÷\frac{6}{7}=$
$\frac{5}{7}÷\frac{5}{6}=$
$\frac{4}{15}+\frac{4}{9}=$
$12÷\frac{8}{5}=$
$20÷\frac{8}{9}=$
$8÷\frac{1}{9}=$
$\frac{4}{3}×\frac{9}{14}=$
$\frac{38}{9}÷\frac{19}{6}=$
$30÷\frac{3}{8}=$
$\frac{3}{2}÷\frac{5}{6}=$

1. $1$ $\frac{64}{9}$ $25$ $\frac{7}{6}$
$\frac{14}{33}$ $250$ $14$ $\frac{9}{2}$
$\frac{1}{2}$ $\frac{21}{20}$ $49$ $\frac{2}{9}$
$10$ $\frac{26}{27}$ $\frac{56}{3}$ $\frac{6}{7}$
$\frac{32}{45}$ $\frac{15}{2}$ $\frac{45}{2}$ $72$
$\frac{6}{7}$ $\frac{4}{3}$ $80$ $\frac{9}{5}$

2. 计算下面各题。
$\frac{8}{5} - \frac{5}{7} - \frac{2}{7}$
$\frac{11}{16} - \frac{4}{9} + \frac{5}{16}$
$\frac{7}{8} + \frac{1}{6} - \frac{5}{12}$

2. $\frac{3}{5}$ $\frac{5}{9}$ $\frac{5}{8}$

3. 在()里填上合适的数。
$\frac{2}{3} × ( ) = \frac{4}{9}$
$\frac{4}{5} × ( ) = 30$
$12 ÷ ( ) = \frac{4}{5}$
$( ) × \frac{2}{7} = \frac{1}{7}$
$( ) × \frac{5}{18} = \frac{1}{12}$
$\frac{9}{4} × ( ) = \frac{3}{5}$

3. $\frac{2}{3}$ $\frac{75}{2}$ $15$
$\frac{1}{2}$ $\frac{3}{10}$ $\frac{4}{15}$

比较$\frac{111}{1111}$和$\frac{1111}{11111}$的大小。

$\frac{111}{1111}＜\frac{1111}{11111}$