一、口算。
0.92 + 4.31 =
11.33 - 1.6 =
2.74 + 5.85 =
4.9 ÷ 0.07 =
2.04 × 0.4 =
0.7 × 0.8 =
1.64 + 0.36 =
2.4 × 4 =
3.2 ÷ 0.16 =
5.8 - 2.08 =
0.81 ÷ 2.7 =
7.05 × 20 =
$\frac{3}{7} + 1.5 =$
$\frac{2}{5} × 0.15 =$
$\frac{7}{8} - 0.4 =$
$\frac{7}{8} - \frac{5}{24} =$
$\frac{5}{8} ÷ \frac{7}{8} =$
$2.1 ÷ \frac{3}{14} =$
$3.2 + \frac{4}{5} =$
$0.24 × \frac{3}{8} =$
$0.75 - \frac{2}{15} =$
$\frac{4}{9} ÷ 0.75 =$
$\frac{7}{30} + \frac{2}{5} =$
$4.5 ÷ \frac{5}{4} =$

1. 5.23
2. 9.73
3. 8.59
4. 70
5. 0.816
6. 0.56
7. 2
8. 9.6
9. 20
10. 3.72
11. 0.3
12. 141
13. $\frac{27}{14}$
14. $\frac{3}{50}$
15. $\frac{19}{40}$
16. $\frac{2}{3}$
17. $\frac{5}{7}$
18. $\frac{49}{5}$
19. 4
20. $\frac{9}{100}$
21. $\frac{37}{60}$
22. $\frac{16}{27}$
23. $\frac{19}{30}$
24. $\frac{18}{5}$

二、计算下面各题，能简算的要简算。
$\frac{3}{40}÷0.2×\frac{2}{3$
$\frac{7}{13}×2.5×\frac{26}{35}$
$\frac{8}{9}-\frac{8}{9}×\frac{4}{5}+0.2$
$\frac{7}{10}×10.1-\frac{7}{10}×0.1$
$1.5×(4.32÷\frac{2}{5})-3.14$
$7.2×[(7.8+\frac{1}{5})÷\frac{8}{5}]$

1. $\frac{1}{4}$
2. 1
3. $\frac{17}{45}$
4. 7
5. 13.06
6. 36