$\frac{5}{6} ÷ \frac{5}{36} =$
$\frac{4}{5} ÷ \frac{8}{15} =$
$2.7 × \frac{7}{9} =$
$20 ÷ \frac{4}{5} =$
$42 ÷ \frac{6}{7} =$
$0.39 × \frac{2}{3} =$
$1.2 ÷ \frac{1}{6} =$
$\frac{3}{5} - \frac{3}{10} =$
$\frac{3}{25} × 60 =$
$\frac{9}{26} ÷ \frac{12}{13} =$
$\frac{3}{4} + \frac{1}{5} =$
$\frac{2}{9} ÷ \frac{3}{8} =$
$\frac{27}{29} ÷ 9 =$
$\frac{7}{16} ÷ \frac{3}{4} =$
$\frac{5}{8} ÷ \frac{25}{32} =$
$\frac{35}{36} ÷ \frac{15}{28} =$

1. 6 $\frac{3}{2}$ 2.1 25
49 0.26 7.2 $\frac{3}{10}$
$\frac{36}{5}$ $\frac{3}{8}$ $\frac{19}{20}$ $\frac{16}{27}$
$\frac{3}{29}$ $\frac{7}{12}$ $\frac{4}{5}$ $\frac{49}{27}$

2 脱式计算（能简算的要简算） 建议用时6分钟 评价：☆☆☆
$\frac{1}{10} ÷ \frac{2}{15} - \frac{3}{8}$
$\frac{7}{12} × \frac{3}{14} ÷ \frac{9}{32}$
$\frac{7}{8} ÷ \frac{9}{14} - \frac{7}{8} × \frac{5}{9}$
$72 ÷ \frac{3}{2} ÷ \frac{8}{7} × \frac{4}{7}$
$\frac{46}{3} ÷ (\frac{5}{4} + \frac{1}{8} + \frac{3}{2})$
$3 - \frac{5}{11} ÷ \frac{15}{22} - \frac{4}{3}$
$(\frac{2}{3} + \frac{1}{5}) ÷ \frac{39}{5} × \frac{9}{7}$
$\frac{21}{40} ÷ (\frac{1}{10} + \frac{3}{5})$
$\frac{23}{16} ÷ [ (\frac{5}{6} + \frac{4}{9}) × 36 ]$
口算学回视

2. $\frac{3}{8}$ $\frac{4}{9}$ $\frac{7}{8}$
24 $\frac{16}{3}$ 1
$\frac{1}{7}$ $\frac{3}{4}$ $\frac{1}{32}$

一项工程，甲队单独做需要10天完成，乙队单独做需要20天完成。如果甲、乙两队合作，那么（）天可以完成这项工程的$\frac{3}{5}$。

3. 4