$\frac{5}{9}×15=$
$\frac{3}{5}×2=$
$\frac{1}{4}×\frac{4}{5}=$
$\frac{1}{9}×\frac{3}{7}=$
$\frac{7}{12}×\frac{3}{4}=$
$5×\frac{3}{20}=$
$\frac{2}{5}×\frac{15}{4}=$
$\frac{4}{17}×34=$
$\frac{8}{21}×\frac{7}{16}=$
$\frac{1}{20}×\frac{2}{3}=$
$\frac{5}{12}×6=$
$4×\frac{1}{8}=$
$\frac{11}{24}×8=$
$\frac{6}{11}×\frac{11}{15}=$
$\frac{4}{7}×5.6=$
$0.24×\frac{1}{6}=$
$42×\frac{9}{14}=$
$\frac{6}{25}×1.5=$
$\frac{9}{8}×6.4=$
$1.8×\frac{8}{9}=$
$\frac{1}{4}×0.8=$
$\frac{4}{21}×\frac{7}{20}=$
$7.5×\frac{3}{5}=$
$\frac{3}{7}×2.8=$

1. $\frac{25}{3}$
2. $\frac{6}{5}$
3. $\frac{1}{5}$
4. $\frac{1}{21}$
5. $\frac{7}{16}$
6. $\frac{3}{4}$
7. $\frac{3}{2}$
8. 8
9. $\frac{1}{6}$
10. $\frac{1}{30}$
11. $\frac{5}{2}$
12. $\frac{1}{2}$
13. $\frac{11}{3}$
14. $\frac{2}{5}$
15. 3.2
16. 0.04
17. 27
18. $\frac{9}{25}$
19. 7.2
20. 1.6
21. 0.2
22. $\frac{1}{15}$
23. 4.5
24. 1.2

2 脱式计算（能简算的要简算）
建议用时6分钟 评价：☆☆☆
$\frac{3}{4} + \frac{2}{9} × 3$
$\frac{3}{85} × 86$
$( \frac{7}{9} + \frac{5}{27} ) × 54$
$\frac{7}{2} × \frac{2}{5} + \frac{7}{2} × \frac{3}{5}$
$\frac{4}{5} × 58 + \frac{4}{5} × 43 - \frac{4}{5}$
$\frac{5}{9} × [ \frac{3}{5} + ( \frac{7}{10} - \frac{2}{5} ) ]$
$\frac{19}{25} × \frac{22}{9} + \frac{23}{25} × \frac{19}{9}$
$15 × \frac{6}{7} - \frac{6}{7}$
$\frac{3}{8} × 0.25 + \frac{1}{4} × \frac{5}{8} - \frac{1}{4}$

1. $\frac{17}{12}$
2. $3\frac{3}{85}$
3. 52
4. 3.5
5. 80
6. $\frac{1}{2}$
7. $\frac{19}{5}$
8. 12
9. 0