一、口算。
$\frac{1}{4} + \frac{5}{8} =$
$\frac{3}{4} - 70\% =$
$9.8 ÷ 98\% =$
$\frac{2}{5} ÷ \frac{1}{2} =$
$\frac{1}{12} + \frac{4}{5} =$
$100 × 1\% =$
$45\% × \frac{4}{9} =$
$91 × \frac{4}{13} =$
$\frac{2}{5} ÷ 80\% =$
$2 + 2\% =$
$5 ÷ \frac{5}{7} =$
$\frac{8}{27} × \frac{9}{16} =$
$\frac{9}{10} - \frac{3}{5} =$
$\frac{7}{4} × \frac{3}{14} =$
$\frac{5}{3} ÷ \frac{10}{7} =$
$\frac{1}{3} + \frac{1}{6} =$
$\frac{9}{8} ÷ \frac{6}{7} =$
$\frac{6}{7} × \frac{4}{9} =$
$\frac{3}{4} × \frac{16}{9} =$
$\frac{7}{36} × 18 =$
$\frac{4}{5} - \frac{3}{7} =$

$\frac{7}{8}$
0.05
10
$\frac{4}{5}$
$\frac{53}{60}$
1
$\frac{1}{5}$
28
$\frac{1}{2}$
2.02
7
$\frac{1}{6}$
$\frac{3}{10}$
$\frac{3}{8}$
$\frac{7}{6}$
$\frac{1}{2}$
$\frac{21}{16}$
$\frac{8}{21}$
$\frac{4}{3}$
$\frac{7}{2}$
$\frac{13}{35}$

二、计算下面各题，能用简便算法的就用简便算法。
$88×(\dfrac{3}{8}+\dfrac{7}{44})$
$75\%-\dfrac{1}{6}×90\%+\dfrac{5}{6}$
$(\dfrac{7}{8}-\dfrac{1}{2})×(\dfrac{5}{6}-\dfrac{1}{2})$
$(\dfrac{5}{24}-\dfrac{7}{36})×24×6$
$4-(\dfrac{2}{5}+\dfrac{1}{3})÷\dfrac{4}{5}$
$16×(12.5\%+50\%+75\%)$

47
$\frac{43}{30}$
$\frac{1}{8}$
2
$3\frac{1}{12}$
22