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

1.$\frac{5}{12}$
2.$\frac{3}{2}$
3.$\frac{12}{5}$
4.$\frac{4}{3}$
5.$\frac{19}{20}$
6.$\frac{5}{3}$
7.$\frac{10}{3}$
8.$4$
9.$\frac{1}{20}$
10.$\frac{18}{5}$
11.$\frac{30}{19}$
12.$\frac{35}{36}$
13.$\frac{115}{91}$
14.$\frac{14}{9}$
15.$\frac{15}{16}$
16.$42$
17.$\frac{1}{12}$
18.$\frac{24}{13}$
19.$16$
20.$\frac{90}{19}$

2. 在括号里填上合适的数。(6☆)
$(\ )÷\frac{3}{4}=\frac{9}{10}$
$\frac{1}{5}÷(\ )=\frac{1}{6}$
$\frac{9}{5}÷(\ )=\frac{5}{4}$
$(\ )÷\frac{3}{7}=\frac{14}{3}$
$(\ )÷\frac{7}{9}=\frac{17}{14}$
$\frac{4}{7}÷(\ )=\frac{8}{15}$

1.$\frac{27}{40}$
2.$\frac{6}{5}$
3.$\frac{36}{25}$
4.$2$
5.$\frac{17}{18}$
6.$\frac{15}{14}$

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

1.$＞$
2.$=$
3.$＜$
4.$＜$
5.$＜$
6.$＞$
7.$＞$
8.$＞$
9.$＞$

4. 计算下面各题。(6☆)
$1÷\frac{3}{8}+\frac{3}{8}÷1$
$27×\frac{3}{10}-\frac{3}{10}÷\frac{1}{7}$
$2-\frac{5}{12}÷\frac{2}{3}-\frac{3}{8}$

1.$\frac{73}{24}$
2.$6$
3.$1$