一、口算。
$0.46÷4.6=$
$0.53×0.4=$
$10-0.99=$
$5.4-3.9=$
$6.26+1.75=$
$0.375÷0.25=$
$3.14+3.14=$
$200×8.5=$
$9.6÷0.3=$
$1.25×4=$
$5.42+0.58=$
$8.02-5.86=$
$\frac{5}{12}+0.4=$
$\frac{5}{6}×\frac{2}{5}=$
$\frac{5}{8}÷\frac{3}{2}=$
$\frac{5}{9}×\frac{4}{5}=$
$\frac{9}{20}-\frac{1}{4}=$
$\frac{3}{14}×\frac{7}{9}=$
$\frac{5}{12}-\frac{1}{10}=$
$\frac{5}{17}÷\frac{5}{51}=$
$\frac{3}{5}+\frac{1}{10}=$
$26×\frac{1}{13}=$
$\frac{5}{6}÷\frac{5}{9}=$
$0.6-\frac{1}{3}=$
$0.46÷4.6=$
$0.53×0.4=$
$10-0.99=$
$5.4-3.9=$
$6.26+1.75=$
$0.375÷0.25=$
$3.14+3.14=$
$200×8.5=$
$9.6÷0.3=$
$1.25×4=$
$5.42+0.58=$
$8.02-5.86=$
$\frac{5}{12}+0.4=$
$\frac{5}{6}×\frac{2}{5}=$
$\frac{5}{8}÷\frac{3}{2}=$
$\frac{5}{9}×\frac{4}{5}=$
$\frac{9}{20}-\frac{1}{4}=$
$\frac{3}{14}×\frac{7}{9}=$
$\frac{5}{12}-\frac{1}{10}=$
$\frac{5}{17}÷\frac{5}{51}=$
$\frac{3}{5}+\frac{1}{10}=$
$26×\frac{1}{13}=$
$\frac{5}{6}÷\frac{5}{9}=$
$0.6-\frac{1}{3}=$
答案
1. 0.1
2. 0.212
3. 9.01
4. 1.5
5. 8.01
6. 1.5
7. 6.28
8. 1700
9. 32
10. 5
11. 6
12. 2.16
13. $\frac{49}{60}$
14. $\frac{1}{3}$
15. $\frac{5}{12}$
16. $\frac{4}{9}$
17. $\frac{1}{5}$
18. $\frac{1}{6}$
19. $\frac{19}{60}$
20. 3
21. $\frac{7}{10}$
22. 2
23. $\frac{3}{2}$
24. $\frac{4}{15}$
2. 0.212
3. 9.01
4. 1.5
5. 8.01
6. 1.5
7. 6.28
8. 1700
9. 32
10. 5
11. 6
12. 2.16
13. $\frac{49}{60}$
14. $\frac{1}{3}$
15. $\frac{5}{12}$
16. $\frac{4}{9}$
17. $\frac{1}{5}$
18. $\frac{1}{6}$
19. $\frac{19}{60}$
20. 3
21. $\frac{7}{10}$
22. 2
23. $\frac{3}{2}$
24. $\frac{4}{15}$
二、计算下面各题,能简算的要简算。
$\frac{4}{5} × 3.12 + \frac{4}{5} × 1.88$
$( \frac{5}{8} - \frac{1}{2} ) × ( \frac{8}{9} ÷ \frac{2}{3} )$
$\frac{1}{5} - ( \frac{1}{5} × \frac{2}{3} - \frac{1}{30} )$
$27.3 × 99 + 27.3$
$0.57 + 1.43 × 2.8$
$19.8 ÷ [ (3.25 - 2.8) × 0.8 ]$
$\frac{4}{5} × 3.12 + \frac{4}{5} × 1.88$
$( \frac{5}{8} - \frac{1}{2} ) × ( \frac{8}{9} ÷ \frac{2}{3} )$
$\frac{1}{5} - ( \frac{1}{5} × \frac{2}{3} - \frac{1}{30} )$
$27.3 × 99 + 27.3$
$0.57 + 1.43 × 2.8$
$19.8 ÷ [ (3.25 - 2.8) × 0.8 ]$
答案
1. 4
2. $\frac{1}{6}$
3. $\frac{1}{10}$
4. 2730
5. 4.574
6. 55
2. $\frac{1}{6}$
3. $\frac{1}{10}$
4. 2730
5. 4.574
6. 55
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