一、口算。
$\frac{7}{10} ÷ \frac{1}{2} =$
$\frac{1}{9} - \frac{1}{10} =$
$80\% + 0.22 =$
$54\% ÷ 90\% =$
$\frac{4}{5} ÷ 8 =$
$\frac{3}{5} × \frac{10}{9} =$
$\frac{5}{3} ÷ \frac{25}{9} =$
$\frac{6}{7} - \frac{1}{6} =$
$24\% ÷ \frac{1}{2} =$
$\frac{1}{4} × \frac{2}{3} =$
$2.5 × 12\% =$
$\frac{13}{15} - \frac{2}{5} =$
$44 ÷ \frac{1}{10} =$
$76\% + 4.14 =$
$36 ÷ \frac{9}{13} =$
$\frac{3}{4} - 75\% =$
$\frac{3}{5} ÷ \frac{4}{15} =$
$\frac{1}{4} + \frac{4}{5} =$
$\frac{5}{8} × \frac{16}{5} =$
$\frac{2}{5} × 3.5 =$
$0.5 ÷ 5\% =$

1.$\frac{7}{5}$
2.$\frac{1}{90}$
3.$1.02$
4.$0.6$
5.$\frac{1}{10}$
6.$\frac{2}{3}$
7.$\frac{3}{5}$
8.$\frac{29}{42}$
9.$\frac{12}{25}$
10.$\frac{1}{6}$
11.$0.3$
12.$\frac{7}{15}$
13.$440$
14.$4.9$
15.$52$
16.$0$
17.$\frac{9}{4}$
18.$\frac{21}{20}$
19.$2$
20.$\frac{7}{5}$
21.$10$

二、计算下面各题，能用简便算法的就用简便算法。
$\frac{1}{8}×75\% + \frac{1}{8}×25\%$
$36×(50\% - \frac{1}{6})$
$\frac{8}{3} - (50\% ÷ 25\% + 40\%)$
$\frac{5}{4}×\frac{9}{25}÷80\%$
$72÷240\%×35\%$
$(\frac{4}{5} + \frac{1}{4})×\frac{7}{3} + 70\%$

1.$\frac{1}{8}$
2.$12$
3.$\frac{4}{15}$
4.$\frac{9}{16}$
5.$10.5$
6.$3.15$