一、简便计算下面各题。
$\frac{3}{5} + \frac{13}{18} + \frac{2}{5} + \frac{23}{18}$ $2.5×32×12.5$ $4.65 + 6.39 + 5.35 + 3.61$
$\frac{2}{13} + \frac{7}{12} + \frac{11}{13} + \frac{5}{12}$ $9.25×9.9 + 9.25×0.1$ $3 - \frac{6}{11} - \frac{7}{11} - \frac{9}{11}$
$\frac{5}{8} - (\frac{1}{8} + \frac{3}{10}) + \frac{7}{10}$ $8.3 - 3.79 + 11.7 - 6.21$ $\frac{29}{16} - (\frac{7}{12} - \frac{3}{16}) - \frac{5}{12}$
$\frac{9}{10} - (\frac{1}{12} + \frac{3}{10})$ $10.7 - 2.7×0.5 - 2.65$ $8.5×20.1 - 0.85$
$\frac{12}{13} + (\frac{9}{11} - \frac{9}{13}) + \frac{2}{11}$ $3.64×0.25 + 4.36×0.25$ $0.25×(4 + 0.8)×12.5$

3 1000 20
2 92.5 1
$\frac{9}{10}$ 10 1
$\frac{31}{60}$ 6.7 170
$1\frac{3}{13}$ 2 15

二、计算下面各题。
$\frac{5}{6} + \frac{7}{9} + \frac{3}{8}$ $(3.8 + 11.7)÷5×2.7$ $4.2×[(14.41 - 1.91)÷2.5]$
$\frac{2}{7} + \frac{3}{14} - \frac{3}{10}$ $(37 - 3.6÷4.8)÷2.5$ $13.6÷(0.9 + 0.8)×2.4$
$\frac{7}{6} - (\frac{7}{10} - \frac{1}{3})$ $(17.8 - 1.3)÷5×1.4$ $2.7×[(2.6 + 5.8)÷0.21]$
$\frac{29}{15} - (\frac{2}{3} + \frac{1}{5})$ $1.05×(3.8 - 0.8)÷6.3$ $73.02 - (138.4 - 80.85)÷2.5$
$\frac{2}{5} + (\frac{5}{8} - \frac{1}{4})$ $4.38 + 7.5×1.2÷0.15$ $25.74÷[(12.3 - 6.8)×1.2]$

$\frac{143}{72}$ 8.37 21
$\frac{1}{5}$ 14.5 19.2
$\frac{4}{5}$ 4.62 108
$\frac{16}{15}$ 0.5 50
$\frac{31}{40}$ 64.38 3.9