$\frac{4}{5} ÷ 24 =$
$32 ÷ \frac{8}{15} =$
$\frac{8}{19} × \frac{2}{3} ÷ \frac{8}{19} × \frac{2}{3} =$
$\frac{8}{19} ÷ \frac{2}{19} =$
$1 ÷ \frac{17}{2} =$
$5 ÷ \frac{5}{6} - \frac{5}{6} ÷ 5 =$
$3.9 ÷ \frac{13}{2} =$
$\frac{12}{23} ÷ 0.8 =$
$\frac{2}{3} ÷ \frac{3}{7} × 0 =$
$\frac{7}{3} ÷ \frac{3}{7} =$
$0.6 ÷ \frac{9}{5} =$
$1.7 × \frac{1}{3} ÷ 1.7 × \frac{1}{3} =$
$\frac{7}{8} - 0.56 =$
$\frac{2}{3} ÷ \frac{4}{9} =$
$( \frac{2}{7} - \frac{1}{6} ) ÷ \frac{1}{63} =$

1. $\frac{1}{30}$ 60 $\frac{4}{9}$ 4 $\frac{2}{17}$ $5\frac{5}{6}$ 0.6 $\frac{15}{23}$ 0 $\frac{49}{9}$ $\frac{1}{3}$ $\frac{1}{9}$ 0.315 $\frac{3}{2}$ $\frac{15}{2}$

2 脱式计算（能简算的要简算）
建议用时4分钟 评价：☆☆☆
$\frac{4}{5} ÷ \frac{5}{9} × \frac{1}{8}$
$\frac{5}{12} ÷ 7 + \frac{7}{12} × \frac{1}{7}$
$\frac{9}{5} - (\frac{2}{5} ÷ \frac{1}{2} + \frac{3}{7})$
$(\frac{7}{8} - \frac{5}{12}) ÷ \frac{1}{24}$
$4.9 × \frac{7}{11} + 6.1 ÷ \frac{11}{7}$
$\frac{2}{3} ÷ [ \frac{9}{14} × (\frac{5}{6} - \frac{4}{9}) ]$

2. $\frac{9}{50}$ $\frac{1}{7}$ $\frac{4}{7}$ 11 7 $\frac{8}{3}$

(1) 水泥：？吨
石灰：
3000吨 比水泥少$\frac{1}{4}$
(2) 150页 $\frac{2}{5}$

？页

3. (1)$3000÷(1-\frac{1}{4})=4000$(吨)
(2)$150÷(1-\frac{2}{5})=250$(页)