一、口算。
0.48 + 0.37 =
1.1 - 0.11 =
0.46 × 100 =
6.06 + 3.4 =
7.2 - 5.6 =
350 ÷ 1000 =
5.4 ÷ 0.6 =
0.4 × 500 =
10 - 4.5 =
0.72 ÷ 0.6 =
2.9 + 3.8 =
5.8 + 2.2 =
6.3 × 0.3 =
7.1 - 4.8 =
6.4 ÷ 0.04 =
$\frac{5}{12} - \frac{1}{3} =$
$\frac{5}{9} + \frac{8}{9} =$
$\frac{3}{7} - \frac{1}{5} =$
$\frac{19}{36} + \frac{1}{12} =$
$\frac{7}{10} - \frac{3}{8} =$
$\frac{4}{15} + \frac{5}{6} =$
$\frac{7}{9} + \frac{1}{7} =$
$\frac{4}{3} - \frac{8}{9} =$
$\frac{7}{10} - \frac{2}{5} =$

1. 0.85
2. 0.99
3. 46
4. 9.46
5. 1.6
6. 0.35
7. 9
8. 200
9. 5.5
10. 1.2
11. 6.7
12. 8
13. 1.89
14. 2.3
15. 160
16. $\frac{1}{12}$
17. $\frac{13}{9}$
18. $\frac{8}{35}$
19. $\frac{11}{18}$
20. $\frac{13}{40}$
21. $\frac{11}{10}$
22. $\frac{58}{63}$
23. $\frac{4}{9}$
24. $\frac{3}{10}$

二、计算下面各题，能用简便算法的就用简便算法。
1.8÷0.4÷0.25−0.7
(7.2×3.4−9.48)÷0.25
1.76−(0.74+0.26)÷0.8
3.24×10.3−3×0.324

1. 17.3
2. 60
3. 0.51
4. 32.4