一、口算。
$\frac{5}{12} ÷ \frac{5}{6} =$
$\frac{5}{7} × \frac{21}{25} =$
$\frac{5}{9} × 1.08 =$
$50\% + 0.45 =$
$0.125 × 160\% =$
$\frac{15}{16} × \frac{2}{3} =$
$\frac{4}{21} × 28 =$
$1 - \frac{7}{12} =$
$80\% ÷ \frac{5}{4} =$
$12\% × \frac{10}{27} =$
$\frac{14}{15} ÷ \frac{2}{3} =$
$\frac{2}{3} - \frac{1}{8} =$
$\frac{5}{9} - \frac{1}{6} =$
$36\% × \frac{5}{9} =$
$\frac{7}{8} ÷ \frac{3}{4} =$
$39 ÷ \frac{13}{10} =$
$3 - 20\% =$
$\frac{3}{8} ÷ \frac{6}{7} =$
$\frac{4}{5} ÷ \frac{8}{15} =$
$\frac{8}{11} ÷ \frac{2}{33} =$
$\frac{4}{5} + \frac{8}{15} =$

$\frac{1}{2}$
$\frac{3}{5}$
0.6
0.95
0.2
$\frac{5}{8}$
$\frac{16}{3}$
$\frac{5}{12}$
$\frac{16}{25}$
$\frac{2}{45}$
$\frac{7}{5}$
$\frac{13}{24}$
$\frac{7}{18}$
$\frac{1}{5}$
$\frac{7}{6}$
30
2.8
$\frac{7}{16}$
$\frac{3}{2}$
12
$\frac{4}{3}$

二、计算下面各题，能用简便算法的就用简便算法。
$(\frac{5}{8} + \frac{2}{27}) × 8 + \frac{11}{27}$
$\frac{5}{8} × 25\% × \frac{24}{5} × 16$
$(25\% + \frac{4}{5}) ÷ \frac{7}{3} + \frac{7}{10}$
$\frac{1}{12} + \frac{5}{26} × (2.5 - \frac{1}{3})$
$48\% × 101 - 0.48$
$(\frac{5}{12} + \frac{1}{6}) ÷ (\frac{2}{5} × \frac{7}{8})$

6
12
$\frac{23}{20}$
$\frac{1}{2}$
48
$\frac{5}{3}$