一、口算。
1.98×0.2=
0.41×5=
4.3+1.7=
2.4×0.5=
9÷0.125=
10-0.04=
0.63÷0.7=
5.6÷1.4=
4.4+1.06=
3×4.2=
6-0.6=
0.125÷0.25=
$\frac{1}{14}÷\frac{3}{7}=$
$\frac{4}{7}÷\frac{5}{8}=$
$\frac{3}{11}×\frac{11}{5}=$
$\frac{5}{27}+\frac{1}{3}=$
$\frac{9}{2}×\frac{4}{15}=$
$\frac{5}{8}-\frac{1}{6}=$
$\frac{5}{7}÷\frac{5}{6}=$
$78÷\frac{13}{48}=$
$\frac{4}{5}×\frac{7}{8}=$
$\frac{2}{3}÷\frac{8}{5}=$
$\frac{2}{5}×\frac{1}{10}=$
$\frac{4}{5}-\frac{1}{3}=$

1. 1.98×0.2=0.396
2. 0.41×5=2.05
3. 4.3+1.7=6
4. 2.4×0.5=1.2
5. 9÷0.125=72
6. 10-0.04=9.96
7. 0.63÷0.7=0.9
8. 5.6÷1.4=4
9. 4.4+1.06=5.46
10. 3×4.2=12.6
11. 6-0.6=5.4
12. 0.125÷0.25=0.5
13. $\frac{1}{14}÷\frac{3}{7}=\frac{1}{6}$
14. $\frac{4}{7}÷\frac{5}{8}=\frac{32}{35}$
15. $\frac{3}{11}×\frac{11}{5}=\frac{3}{5}$
16. $\frac{5}{27}+\frac{1}{3}=\frac{14}{27}$
17. $\frac{9}{2}×\frac{4}{15}=\frac{6}{5}$
18. $\frac{5}{8}-\frac{1}{6}=\frac{11}{24}$
19. $\frac{5}{7}÷\frac{5}{6}=\frac{6}{7}$
20. $78÷\frac{13}{48}=288$
21. $\frac{4}{5}×\frac{7}{8}=\frac{7}{10}$
22. $\frac{2}{3}÷\frac{8}{5}=\frac{5}{12}$
23. $\frac{2}{5}×\frac{1}{10}=\frac{1}{25}$
24. $\frac{4}{5}-\frac{1}{3}=\frac{7}{15}$

二、计算下面各题，能简算的要简算。
$34 - 34×\frac{16}{17}$
$\frac{20}{13}÷7 + \frac{1}{7}×\frac{6}{13}$
$\frac{5}{6}×\frac{6}{5} - \frac{9}{10}÷\frac{9}{5}$
$3.2×1.25÷0.8$
$(72 - 72×0.9)÷1.2$
$7.05 - 2.24 - 1.76 + 5.95$

1. $34 - 34×\frac{16}{17}=2$
2. $\frac{20}{13}÷7 + \frac{1}{7}×\frac{6}{13}=\frac{2}{7}$
3. $\frac{5}{6}×\frac{6}{5} - \frac{9}{10}÷\frac{9}{5}=\frac{1}{2}$
4. $3.2×1.25÷0.8=5$
5. $(72 - 72×0.9)÷1.2=6$
6. $7.05 - 2.24 - 1.76 + 5.95=9$