一、口算。
$\frac{1}{2} + \frac{3}{4} =$
$\frac{2}{3} ÷ \frac{5}{12} =$
$60\% × \frac{4}{9} =$
$1.2 × \frac{5}{6} =$
$\frac{3}{5} - \frac{1}{20} =$
$\frac{3}{4} ÷ \frac{6}{7} =$
$5.1 ÷ 1\% =$
$\frac{7}{24} × \frac{3}{14} =$
$15\% × 20 =$
$\frac{5}{8} × \frac{1}{4} =$
$100 × 0.1\% =$
$\frac{16}{5} ÷ \frac{8}{7} =$
$\frac{1}{8} ÷ \frac{5}{32} =$
$\frac{4}{7} × 56 =$
$\frac{2}{5} + \frac{5}{12} =$
$\frac{5}{9} ÷ \frac{1}{3} =$
$\frac{7}{8} - \frac{5}{6} =$
$\frac{3}{10} × \frac{5}{12} =$
$\frac{9}{14} × \frac{7}{12} =$
$80\% ÷ \frac{8}{15} =$
$\frac{5}{6} + \frac{1}{2} =$

1.$\frac{5}{4}$
2.$\frac{8}{5}$
3.$\frac{4}{15}$
4.$1$
5.$\frac{11}{20}$
6.$\frac{7}{8}$
7.$510$
8.$\frac{1}{16}$
9.$3$
10.$\frac{5}{32}$
11.$0.1$
12.$\frac{14}{5}$
13.$\frac{4}{5}$
14.$32$
15.$\frac{49}{60}$
16.$\frac{5}{3}$
17.$\frac{1}{24}$
18.$\frac{1}{8}$
19.$\frac{3}{8}$
20.$\frac{3}{2}$
21.$\frac{4}{3}$

二、计算下面各题，能用简便算法的就用简便算法。
$16×(\dfrac{3}{4}+\dfrac{7}{16}-\dfrac{7}{8})$
$23-\dfrac{6}{7}×\dfrac{15}{6}-\dfrac{6}{7}$
$25\%×[(23+2\%)×4]$
$\dfrac{9}{5}÷[(\dfrac{1}{2}-\dfrac{1}{3})×\dfrac{4}{15}]$
$35\%×98+70\%$
$3.5×0.6+5.5×60\%+\dfrac{3}{5}$

1.$5$
2.$20$
3.$23.02$
4.$\frac{81}{2}$
5.$35$
6.$6$