$5.8 ÷ 20\% =$
$28 × 50\% =$
$70 × 41\% - 100\% =$
$63\% × \frac{2}{9} =$
$20 ÷ 50\% =$
$\frac{5}{6} × 36\% ÷ \frac{3}{10} =$
$5.6 ÷ 40\% =$
$12.5 × 80\% =$
$(1 + 80\%) ÷ 30 =$
$\frac{5}{7} × 35\% =$
$48\% - 0.38 =$
$16.8 ÷ (1 - 70\%) =$

1. 29
2. 14
3. 27.7
4. 0.14
5. 40
6. 1
7. 14
8. 10
9. 0.06
10. 0.25
11. 0.1
12. 56

2 脱式计算（能简算的要简算） 建议用时6分钟 评价：☆☆☆
$\frac{21}{5} ÷ 7 × \frac{5}{9}$
$\frac{1}{8} × \frac{9}{7} + \frac{5}{7} ÷ 8$
$\frac{1}{2} × 20\% + \frac{5}{8} ÷ \frac{5}{24}$
$0.625 × \frac{2}{5} ÷ \frac{11}{8} - \frac{2}{11}$
$\frac{8}{33} × (\frac{7}{2} - 0.2) ÷ \frac{2}{3}$
$\frac{8}{15} × [ \frac{5}{6} ÷ (\frac{7}{9} - \frac{1}{3}) ]$
$8 × 25\% × 4 × 1.25$
$51 × (\frac{4}{17} - \frac{4}{21}) × 42$
$9.5 × \frac{5}{8} + 7.5 × 62.5\% - 0.625$

1. $\frac{1}{3}$
2. $\frac{1}{4}$
3. 3.1
4. 0
5. $\frac{6}{5}$
6. 1
7. 10
8. 96
9. 10