一、口算。
$10.23 - 4.03 =$
$14.7 × 100 =$
$148 ÷ 4 =$
$33.25 + 22.5 =$
$2.58 × 20 =$
$26.6 ÷ 0.7 =$
$7500 ÷ 500 =$
$6.3 - 0.36 =$
$0.084 ÷ 0.03 =$
$474 + 826 =$
$12.4 × 0.07 =$
$6.48 ÷ 0.3 =$
$\frac{1}{2} ÷ \frac{1}{6} =$
$\frac{4}{5} × \frac{5}{12} =$
$\frac{5}{16} × \frac{8}{15} =$
$\frac{17}{9} - \frac{4}{3} =$
$\frac{9}{13} × \frac{2}{3} =$
$\frac{1}{6} + \frac{2}{3} =$
$16 ÷ \frac{4}{3} =$
$3 - \frac{6}{7} =$
$\frac{2}{7} ÷ \frac{1}{7} =$
$\frac{1}{6} × \frac{3}{8} =$
$\frac{4}{7} ÷ 4 =$
$\frac{3}{4} × 0.88 =$

1. 6.2
2. 1470
3. 37
4. 55.75
5. 51.6
6. 38
7. 15
8. 5.94
9. 2.8
10. 1300
11. 0.868
12. 21.6
13. 3
14. $\frac{1}{3}$
15. $\frac{1}{6}$
16. $\frac{5}{9}$
17. $\frac{6}{13}$
18. $\frac{5}{6}$
19. 12
20. $2\frac{1}{7}$
21. 2
22. $\frac{1}{16}$
23. $\frac{1}{7}$
24. $\frac{33}{50}$

二、计算下面各题，能简算的要简算。
$\frac{5}{13} ÷ 7 + \frac{1}{7} × \frac{9}{13}$
$( \frac{1}{6} + \frac{7}{15} ) ÷ \frac{2}{5} + \frac{5}{12}$
$[ 1 - ( \frac{1}{4} + \frac{5}{8} ) ] ÷ \frac{3}{4}$
$56.5 × 9.9 + 56.5$
$0.25 × (4.8 - 7.5 ÷ 3)$
$3.56 - 1.3 + 1.44 + 6.3$

1. $\frac{2}{13}$
2. 2
3. $\frac{1}{6}$
4. 615.85
5. 0.575
6. 10