1. 口算。（建议用时4分钟）
$\frac{1}{3} ÷ \frac{4}{5} =$
$\frac{4}{3} ÷ \frac{3}{4} =$
$\frac{9}{8} ÷ \frac{5}{6} =$
$\frac{1}{6} ÷ \frac{9}{10} =$
$0 ÷ \frac{1}{100} =$
$\frac{3}{7} ÷ \frac{1}{3} =$
$\frac{21}{40} ÷ \frac{7}{8} =$
$\frac{13}{20} ÷ 13 =$
$12 ÷ \frac{2}{7} =$
$\frac{15}{16} ÷ 5 =$
$\frac{1}{8} ÷ \frac{5}{2} =$
$\frac{3}{8} ÷ \frac{6}{7} =$
$\frac{8}{15} ÷ \frac{2}{5} =$
$\frac{7}{26} ÷ \frac{21}{13} =$
$\frac{5}{33} ÷ \frac{5}{22} =$
$\frac{5}{24} ÷ 5 =$
$\frac{1}{5} ÷ \frac{7}{10} =$
$\frac{5}{8} ÷ \frac{1}{6} =$
$0.61 ÷ \frac{61}{100} =$
$\frac{3}{5} ÷ \frac{7}{12} =$
$\frac{4}{5} ÷ 4 =$
$\frac{5}{6} ÷ \frac{5}{2} =$
$1.125 ÷ \frac{1}{8} =$
$\frac{9}{10} ÷ \frac{1}{3} =$

1. $\frac{5}{12}$
$\frac{16}{9}$
$\frac{27}{20}$
$\frac{5}{27}$
0
$\frac{9}{7}$
$\frac{3}{5}$
$\frac{1}{20}$
42
$\frac{3}{16}$
$\frac{1}{20}$
$\frac{7}{16}$
$\frac{4}{3}$
$\frac{1}{6}$
$\frac{2}{3}$
$\frac{1}{24}$
$\frac{2}{7}$
$\frac{15}{4}$
1
$\frac{36}{35}$
$\frac{1}{5}$
$\frac{1}{3}$
9
$\frac{27}{10}$

2. 在□里填上合适的数。(建议用时2分钟)

2. $\frac{4}{7}$
$\frac{5}{7}$
$\frac{6}{7}$
$\frac{5}{16}$
$\frac{1}{2}$
$\frac{1}{3}$
$\frac{1}{4}$
$\frac{5}{8}$
$\frac{5}{6}$
$\frac{10}{9}$
$\frac{25}{9}$
$\frac{5}{2}$

3. 计算下面各题，能用简便算法的就用简便算法。（建议用时2分钟）
$25×\frac{6}{11}÷\frac{1}{4}$
$\frac{3}{20}×(\frac{4}{7}÷\frac{3}{14})$
$64×\frac{3}{8}+16÷2\frac{2}{3}$

3. $\frac{600}{11}$
$\frac{2}{5}$
30

4. 解决问题。(建议用时2分钟)
一条公路,甲队单独修要20天完成,乙队单独修要30天完成,丙队单独修要15天完成。若甲队单独修2天后撤出,再由乙、丙两队合修6天,还剩300米未修,则公路全长多少米？

4. $\frac{1}{20}×2+(\frac{1}{30}+\frac{1}{15})×6=\frac{7}{10}$
$300÷(1-\frac{7}{10})=1000$(米)