一、口算。
$\frac{6}{7} ÷ \frac{18}{7} =$
$0.61 ÷ \frac{61}{100} =$
$\frac{1}{3} × \frac{4}{7} + \frac{2}{3} × \frac{4}{7} =$
$9.9 × \frac{1}{18} =$
$\frac{7}{8} × 0.875 =$
$30 ÷ (1 + \frac{1}{5}) =$
$\frac{14}{15} × \frac{10}{7} =$
$0.04 ÷ 40\% =$
$\frac{1}{12} × 5 × \frac{12}{19} =$
$0.9 × 110\% =$
$\frac{23}{33} ÷ \frac{25}{33} =$
$\frac{3}{4} + 30\% + \frac{1}{4} + 70\% =$
$45\% - \frac{1}{8} =$
$\frac{11}{27} ÷ 44 =$
$(\frac{1}{4} + \frac{1}{3}) × 36 =$
$6.4 × \frac{9}{8} =$
$\frac{6}{35} ÷ \frac{1}{5} =$
$\frac{34}{35} × 36 - \frac{34}{35} =$
$\frac{2}{5} × \frac{3}{5} =$
$\frac{3}{8} ÷ \frac{9}{32} =$
$45 ÷ \frac{9}{14} × \frac{2}{7} =$

1.$\frac{1}{3}$ 2.$1$ 3.$\frac{4}{7}$ 4.$0.55$ 5.$\frac{49}{64}$ 6.$25$ 7.$\frac{4}{3}$ 8.$0.1$ 9.$\frac{5}{19}$ 10.$0.99$ 11.$\frac{23}{25}$ 12.$2$ 13.$\frac{13}{40}$ 14.$\frac{1}{108}$ 15.$21$ 16.$7.2$ 17.$\frac{6}{7}$ 18.$34$ 19.$\frac{6}{25}$ 20.$\frac{4}{3}$ 21.$20$

二、计算下面各题。
$10÷\frac{5}{9}+\frac{1}{9}×6$
$50\%+\frac{9}{20}÷\frac{3}{10}-\frac{5}{8}$
$70\%+\frac{1}{2}÷4+35\%$
$(\frac{4}{5}-\frac{4}{9}×\frac{3}{10})÷\frac{3}{2}$
$\frac{9}{5}÷(\frac{3}{5}-\frac{1}{25}×\frac{3}{2})$
$(\frac{9}{10}+\frac{3}{5})×(\frac{2}{9}-\frac{2}{15})$

1.$18\frac{2}{3}$ 2.$\frac{11}{8}$ 3.$\frac{47}{40}$ 4.$\frac{4}{9}$ 5.$\frac{10}{3}$ 6.$\frac{2}{15}$