计算下面各题，怎样简便就怎样计算。
$ \frac{3}{8} ÷ \frac{1}{4} + \frac{5}{8} × 4 $
$ ( \frac{7}{24} + \frac{11}{18} - \frac{2}{9} ) × 18 $
$ 81 ÷ ( 5 - 0.5\% × 500 × \frac{9}{5} ) $
$ 2 - \frac{6}{13} ÷ \frac{9}{26} - \frac{2}{3} $
$ \frac{1}{3} ÷ [ ( \frac{2}{3} + \frac{1}{5} ) × \frac{2}{13} ] $
$ \frac{4}{5} ÷ [ 16 × (75\% - 70\%) ] $
12.56 - 3.74 - 4.26
806 ÷ (580 - 9 × 61)
$ 3.64 × [ 1 ÷ ( \frac{21}{10} - 2.09 ) ] $
$ 23 - 40 × ( \frac{1}{5} - \frac{1}{8} ) $
$ (80\% + 25\%) ÷ \frac{7}{5} + \frac{5}{4} $
1.25 × 0.72 × 8 × 10
7.4 - 2.6 + 8.6 - 6.4
$ \frac{7}{12} ÷ \frac{14}{9} + \frac{5}{12} × \frac{9}{14} $
$ \frac{8}{33} ÷ [ \frac{1}{9} ÷ ( 75\% - \frac{2}{3} ) ] $
$ 8 ÷ \frac{4}{5} - \frac{4}{5} ÷ 8 $
$ 15 × ( \frac{1}{5} + \frac{1}{8} ) × 8 $
(16.5 - 3.07 - 2.93) ÷ 0.7
$ 63 × ( 1 - \frac{2}{7} ) ÷ \frac{5}{14} $
$ 40\% × \frac{8}{5} + 60\% × \frac{18}{5} $
1.9 × 0.36 + 0.19 × 7.4 - 1.9
$ \frac{14}{11} - 0.43 + \frac{8}{11} - 0.57 $
15 × 782 ÷ 23 - 240  $ \frac{7}{8} ÷ [ (60\% - 10\%) × \frac{3}{2} ] \frac{11}{25} × 199 + \frac{11}{25} \frac{12}{5} - ( \frac{2}{5} + \frac{4}{9} ) - \frac{5}{9} \frac{5}{21} ÷ [ 25\% × ( \frac{3}{7} + \frac{5}{7} ) ] 72 × ( \frac{5}{6} - \frac{5}{8} + 75\% ) 10 ÷ \frac{5}{7} + 50\% ÷ \frac{2}{3} ( \frac{9}{4} - 25\% ) × 150\% - 150\% $

4
$\frac{49}{4}$
162
0
$\frac{5}{2}$
1
4.56
26
364
20
2
72
7
$\frac{9}{14}$
$\frac{2}{11}$
$9\frac{9}{10}$
39
15
126
$\frac{14}{5}$
0.19
1
270
$\frac{7}{6}$
88
1
$\frac{5}{6}$
69
$14\frac{3}{4}$
1.5