一、口算。
$1.3 + 0.26 =$
$2.05 × 0.8 =$
$4.2 - 3.6 =$
$1.75 ÷ 0.7 =$
$0.8 + 0.6 =$
$1.05 × 80 =$
$1.3 + 8.46 =$
$0.8 - 0.45 =$
$5.24 + 3.76 =$
$1.26 ÷ 0.3 =$
$14.5 - 0.24 =$
$0.96 ÷ 0.3 =$
$\frac{4}{15} + \frac{3}{20} =$
$\frac{7}{6} × \frac{3}{14} =$
$\frac{5}{14} × 0.6 =$
$\frac{7}{15} + \frac{1}{3} =$
$\frac{8}{9} - \frac{5}{18} =$
$0.8 ÷ \frac{5}{8} =$
$\frac{5}{12} × \frac{2}{5} =$
$\frac{3}{4} - 0.2 =$
$6 × \frac{2}{3} =$
$\frac{8}{15} ÷ \frac{8}{25} =$
$\frac{1}{10} ÷ \frac{1}{100} =$
$\frac{4}{7} ÷ \frac{1}{5} =$

1. 1.56
2. 1.64
3. 0.6
4. 2.5
5. 1.4
6. 84
7. 9.76
8. 0.35
9. 9
10. 4.2
11. 14.26
12. 3.2
13. $\frac{5}{12}$
14. $\frac{1}{4}$
15. $\frac{3}{14}$
16. $\frac{4}{5}$
17. $\frac{11}{18}$
18. $\frac{32}{25}$
19. $\frac{1}{6}$
20. $\frac{11}{20}$
21. 4
22. $\frac{5}{3}$
23. 10
24. $\frac{20}{7}$

二、计算下面各题，能简算的要简算。
$\frac{5}{7}×16 - 2÷\frac{7}{5}$
$(\frac{1}{5} + \frac{2}{3} - \frac{4}{15})÷\frac{1}{30}$
$(\frac{1}{15} + \frac{3}{49})×15 - \frac{45}{49}$
$12.5×32×12.5$
$7.8×2.4 + 2.2×2.4$
$[1 - (0.4 + 0.45)]÷0.15$

1. 10
2. 18
3. 1
4. 5000
5. 24
6. 1