一、口算。
2.74 + 5.85 =
0.92 + 4.31 =
11.33 - 1.6 =
2.04 × 0.4 =
0.7 × 0.8 =
4.9 ÷ 0.07 =
2.4 × 4 =
1.64 + 0.36 =
5.8 - 2.08 =
3.2 ÷ 0.16 =
7.05 × 20 =
0.81 ÷ 2.7 =
0.24 × $\frac{3}{8}$ =
$\frac{5}{6}$ - 0.6 =
2.1 ÷ $\frac{3}{14}$ =
3.2 + $\frac{4}{5}$ =
0.36 ÷ $\frac{2}{3}$ =
0.75 - $\frac{2}{15}$ =
$\frac{7}{8}$ - $\frac{5}{24}$ =
$\frac{3}{7}$ + 1.5 =
$\frac{7}{8}$ - 0.4 =
$\frac{7}{30}$ + $\frac{2}{5}$ =
4.5 ÷ $\frac{5}{4}$ =
$\frac{4}{9}$ ÷ 0.75 =

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

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

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