$\frac{1}{2} ÷ 3 =$
$\frac{9}{13} ÷ 9\% =$
$\frac{5}{9} × 60\% =$
$\frac{1}{4} + \frac{5}{16} =$
$\frac{11}{16} × \frac{5}{11} =$
$\frac{4}{27} × \frac{9}{16} =$
$2.4 × \frac{5}{6} =$
$\frac{3}{8} × \frac{3}{8} =$
$\frac{5}{11} × 0 =$
$\frac{1}{14} ÷ \frac{3}{7} =$
$22\% ÷ \frac{11}{13} =$
$6.8 ÷ 10\% =$
$\frac{7}{15} × 45\% =$
$\frac{4}{5} × \frac{35}{24} =$
$1.6 ÷ \frac{2}{5} =$
$\frac{7}{24} ÷ \frac{21}{8} =$
$\frac{7}{9} × \frac{1}{8} =$
$\frac{3}{7} ÷ \frac{9}{14} =$
$\frac{6}{7} × \frac{7}{6} =$
$1 ÷ 20\% =$
$\frac{5}{18} ÷ \frac{5}{18} =$
$\frac{1}{8} × 8 =$
$\frac{1}{2} ÷ \frac{1}{6} =$
$\frac{3}{8} × \frac{4}{5} =$

1. $\frac{1}{6}$
$\frac{100}{13}$
$\frac{1}{3}$
$\frac{9}{16}$
$\frac{5}{16}$
$\frac{1}{12}$
2
$\frac{9}{64}$
0
$\frac{1}{6}$
$\frac{13}{50}$
68
0.21
$\frac{7}{6}$
4
$\frac{1}{9}$
$\frac{7}{72}$
$\frac{2}{3}$
1
5
1
1
3
$\frac{3}{10}$

$\frac{15}{17} ÷ \frac{3}{32} + \frac{2}{17} × \frac{32}{3}$
$7\frac{5}{6} + 7.9 + 2\frac{1}{6} + 3.1$
$\frac{2}{3} + (\frac{1}{2} + \frac{2}{3}) × \frac{2}{3}$
$24 × (\frac{1}{4} + \frac{2}{3} + \frac{1}{6})$
$6.8 ÷ \frac{5}{3} + 3.2 × 60\%$
$\frac{4}{5} × [ \frac{13}{16} ÷ (0.75 + \frac{1}{3}) ]$

2. $\frac{32}{3}$
21
$1\frac{4}{9}$
26
6
$\frac{3}{5}$

我们在洗脸时，如果开水龙头用大水量冲洗，一次大约需要2升水；如果用中等水量冲洗，一次可节水60%。 用中等水量洗脸，一次大约需要（）升水。

3. 0.8