一、口算。
$\frac{1}{9} ÷ 3 =$
$\frac{3}{5} ÷ 5 =$
$\frac{1}{2} ÷ 4 =$
$\frac{8}{9} ÷ 8 =$
$\frac{1}{5} ÷ 7 =$
$\frac{1}{6} ÷ 2 =$
$\frac{5}{7} ÷ 10 =$
$\frac{5}{11} ÷ 15 =$
$\frac{17}{36} ÷ 17 =$
$\frac{7}{18} ÷ 14 =$
$\frac{5}{21} ÷ 35 =$
$\frac{4}{15} ÷ 6 =$
$\frac{6}{11} ÷ 8 =$
$\frac{3}{4} ÷ 24 =$
$\frac{8}{11} ÷ 16 =$
$\frac{2}{3} ÷ 7 =$
$\frac{3}{8} ÷ 6 =$
$\frac{2}{5} ÷ 10 =$
$\frac{10}{11} ÷ 5 =$
$\frac{15}{28} ÷ 10 =$
$\frac{2}{5} ÷ 4 =$

1.$\frac{1}{27}$
2.$\frac{3}{25}$
3.$\frac{1}{8}$
4.$\frac{1}{9}$
5.$\frac{1}{35}$
6.$\frac{1}{12}$
7.$\frac{1}{14}$
8.$\frac{1}{33}$
9.$\frac{1}{36}$
10.$\frac{1}{36}$
11.$\frac{1}{147}$
12.$\frac{2}{45}$
13.$\frac{3}{44}$
14.$\frac{1}{32}$
15.$\frac{1}{22}$
16.$\frac{2}{21}$
17.$\frac{1}{16}$
18.$\frac{1}{25}$
19.$\frac{2}{11}$
20.$\frac{3}{56}$
21.$\frac{1}{10}$

二、计算下面各题，能用简便算法的就用简便算法。
$(\frac{7}{11} - \frac{1}{4}) × 44$
$\frac{1}{10} × (\frac{1}{2} + \frac{1}{3}) × 8$
$15 - 48 × (\frac{1}{12} + \frac{3}{16})$
$\frac{4}{7} × 1.1 + \frac{3}{7} × 0.3$
$(\frac{4}{21} + \frac{4}{7}) × 42$
$\frac{11}{3} × \frac{3}{11} + 15 × \frac{1}{15}$

1.$17$
2.$\frac{2}{3}$
3.$2$
4.$\frac{53}{70}$
5.$32$
6.$2$