1. 直接写出得数。(20☆)
$\frac{2}{3} - \frac{1}{4} =$
$1 ÷ \frac{2}{3} =$
$1 ÷ ( \frac{2}{3} - \frac{1}{4} ) =$
$1 ÷ ( \frac{1}{2} + \frac{1}{4} ) =$
$\frac{1}{5} + \frac{3}{4} =$
$1 ÷ \frac{3}{5} =$
$1 ÷ ( \frac{1}{5} + \frac{1}{10} ) =$
$1 ÷ ( \frac{3}{4} - \frac{1}{2} ) =$
$\frac{1}{4} - \frac{1}{5} =$
$1 ÷ \frac{1}{18} =$
$1 ÷ ( \frac{5}{6} - \frac{1}{5} ) =$
$1 ÷ ( \frac{3}{5} + \frac{3}{7} ) =$
$\frac{4}{7} + \frac{9}{13} =$
$1 ÷ \frac{9}{14} =$
$1 ÷ ( \frac{4}{5} + \frac{4}{15} ) =$
$1 ÷ ( \frac{1}{6} - \frac{1}{7} ) =$
$\frac{5}{6} - \frac{3}{4} =$
$1 ÷ \frac{13}{24} =$
$1 ÷ ( \frac{1}{8} - \frac{1}{16} ) =$
$1 ÷ ( \frac{1}{9} + \frac{1}{10} ) =$

1.$\frac{5}{12}$ $\frac{3}{2}$ $\frac{12}{5}$ $\frac{4}{3}$
$\frac{19}{20}$ $\frac{5}{3}$ $\frac{10}{3}$ 4
$\frac{1}{20}$ 18 $\frac{30}{19}$ $\frac{35}{36}$
$\frac{115}{91}$ $\frac{14}{9}$ $\frac{15}{16}$ 42
$\frac{1}{12}$ $\frac{24}{13}$ 16 $\frac{90}{19}$

2. 在○里填上“＞”“＜”或“=”。(18☆)
$1÷\frac{3}{14} ◯ \frac{3}{14}÷1$
$\frac{7}{8}+\frac{7}{8} ◯ \frac{7}{8}÷\frac{1}{2}$
$\frac{3}{5}×\frac{4}{7} ◯ \frac{4}{5}÷\frac{3}{7}$
$\frac{2}{5}÷(1+\frac{7}{10}) ◯ \frac{2}{5}×(1+\frac{7}{10})$
$\frac{3}{4}÷(1+\frac{1}{3}) ◯ \frac{3}{4}+\frac{3}{4}÷\frac{1}{3}$
$\frac{13}{14}÷\frac{5}{7} ◯ 2÷\frac{5}{3}$
$\frac{7}{8}÷(1-\frac{3}{4}) ◯ \frac{7}{8}×(1-\frac{3}{4})$
$\frac{3}{5}÷(1-\frac{1}{10}) ◯ \frac{2}{9}÷(1-\frac{1}{10})$
$\frac{14}{15}×\frac{5}{7} ◯ \frac{18}{25}÷\frac{20}{9}$

2. ＞ = ＜
＜ ＜ ＞
＞ ＞ ＞

3. 计算下面各题。(12☆)
$30÷\frac{4}{3}÷\frac{5}{6}$
$\frac{3}{5}+0.8÷\frac{2}{7}$
$20÷\frac{13}{9}÷\frac{5}{6}$
$1÷\frac{3}{8}+\frac{3}{8}÷1$
$27×\frac{3}{10}-\frac{3}{10}÷\frac{1}{7}$
$2-\frac{5}{12}÷\frac{2}{3}-\frac{3}{8}$
用时：分钟 ★共得：☆/50 ☆

3. 27 $\frac{17}{5}$ $\frac{216}{13}$
$\frac{73}{24}$ 6 1