一、口算。
0.36×2=
1.08×50=
5.17-2.69=
2.82+1.78=
89÷2=
623-598=
1.9+10.01=
2.48÷0.8=
7.32×4=
0.84÷2.1=
66.26+20.74=
3.4÷0.17=
$1÷\frac{5}{6}=$
$\frac{2}{17}÷\frac{6}{17}=$
$\frac{4}{5}×0.25=$
$\frac{1}{3}×\frac{3}{10}=$
$0.25÷\frac{9}{10}=$
$\frac{5}{6}×\frac{7}{10}=$
$\frac{4}{5}÷\frac{2}{3}=$
$\frac{5}{8}×\frac{4}{15}=$
$\frac{5}{3}×\frac{1}{3}=$
$\frac{7}{12}÷\frac{3}{4}=$
$\frac{7}{12}-\frac{1}{4}=$
$\frac{3}{4}×\frac{2}{9}=$

1. 0.72
2. 54
3. 2.48
4. 4.6
5. 44.5
6. 25
7. 11.91
8. 3.1
9. 29.28
10. 0.4
11. 87
12. 20
13. $\frac{6}{5}$
14. $\frac{1}{3}$
15. $\frac{1}{5}$
16. $\frac{1}{10}$
17. $\frac{5}{18}$
18. $\frac{7}{12}$
19. $\frac{6}{5}$
20. $\frac{1}{6}$
21. $\frac{5}{9}$
22. $\frac{7}{9}$
23. $\frac{1}{3}$
24. $\frac{1}{6}$

二、计算下面各题，能简算的要简算。
$\frac{5}{44} ÷ [ \frac{5}{8} ÷ ( \frac{14}{3} - \frac{1}{2} ) ]$
$( \frac{2}{3} + \frac{1}{4} ÷ \frac{3}{4} ) × \frac{1}{4}$
$\frac{8}{7} × [ 0.75 - ( \frac{9}{16} - \frac{1}{4} ) ]$
$3.28 ÷ 4 ÷ (0.67 - 0.42)$
$0.56 × 8.3 + 0.44 × 8.3$
$168.1 ÷ (4.3 × 2 - 0.4)$

1. $\frac{25}{33}$
2. $\frac{1}{4}$
3. $\frac{1}{2}$
4. 3.28
5. 8.3
6. 20.5