一、口算。
$ \frac{5}{6} ÷ \frac{11}{18} = $
$ 3.75 - 0.65 = $
$ \frac{15}{7} × \frac{7}{8} = $
$ 365 + 635 = $
$ \frac{7}{20} ÷ \frac{1}{5} = $
$ \frac{4}{7} - \frac{1}{8} = $
$ \frac{5}{6} × \frac{34}{35} = $
$ \frac{3}{4} + \frac{7}{20} = $
$ 2.3 ÷ 0.05 = $
$ 0.62 × 0.5 = $
$ \frac{5}{4} - \frac{1}{4} = $
$ \frac{4}{9} + \frac{3}{4} = $
$ \frac{9}{5} ÷ \frac{3}{10} = $
$ \frac{14}{9} - \frac{4}{3} = $
$ 6.5 × 40 = $
$ \frac{35}{8} × \frac{1}{25} = $
$ 98.5 + 3.5 = $
$ 6800 ÷ 17 = $
$ 1 - 71\% = $
$ 15.7 ÷ 3.14 = $
$ \frac{5}{7} + \frac{3}{7} = $

一、$\frac{15}{11}$ 3.1 $\frac{15}{8}$ 1000 $\frac{7}{4}$ $\frac{25}{56}$ $\frac{17}{21}$ $\frac{11}{10}$ 46 0.31 1 $\frac{43}{36}$ 6 $\frac{2}{9}$ 260 $\frac{7}{40}$ 102 400 0.29 5 $\frac{8}{7}$

二、计算下面各题，怎样简便就怎样计算。
$ 18 × 42 - 1308 ÷ 12 $
$ 1.2 × 7 - 4.58 - 0.42 $
$ \frac{6}{7} × 4 + \frac{2}{7} × 30 $
$ 11 ÷ [\frac{6}{11} × (75\% + \frac{1}{6})] $
$ 9.67 - (2.96 + 1.67) - 0.04 $

二、647 3.4 12 22 5

$18×42 - 1308÷12$
$=756 - 109$
$=647$
$1.2×7 - 4.58 - 0.42$
$=8.4 - (4.58 + 0.42)$
$=8.4 - 5$
$=3.4$
$\frac{6}{7}×4 + \frac{2}{7}×30$
$=\frac{24}{7} + \frac{60}{7}$
$=\frac{84}{7}$
$=12$
$11÷[\frac{6}{11}×(75\% + \frac{1}{6})]$
$=11÷[\frac{6}{11}×(\frac{3}{4} + \frac{1}{6})]$
$=11÷[\frac{6}{11}×(\frac{9}{12} + \frac{2}{12})]$
$=11÷[\frac{6}{11}×\frac{11}{12}]$
$=11÷\frac{1}{2}$
$=22$
$9.67 - (2.96 + 1.67) - 0.04$
$=9.67 - 2.96 - 1.67 - 0.04$
$=(9.67 - 1.67) - (2.96 + 0.04)$
$=8 - 3$
$=5$