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一、口算。
0.32+2.88=
125×8=
2.45×0.4=
420÷14=
1-$\frac{4}{5}$=
0.4+$\frac{5}{6}$=
15×$\frac{4}{5}$=
$\frac{3}{4}-\frac{2}{3}$=
0.32+2.88=
3.2
7.2÷1.8=4
7.4×50=370
125×8=
1000
3.8+1.12=4.92
8×7.5=60
2.45×0.4=
0.98
1.6-0.16=1.44
1.64÷0.4=4.1
420÷14=
30
750÷25=30
1998÷9=222
1-$\frac{4}{5}$=
$\frac{1}{5}$
$\frac{4}{9}×\frac{6}{11}$=$\frac{8}{33}$
$\frac{1}{4}÷\frac{1}{2}$=$\frac{1}{2}$
0.4+$\frac{5}{6}$=
$\frac{37}{30}$
$\frac{5}{28}÷\frac{1}{7}$=$\frac{5}{4}$
$\frac{2}{3}×\frac{5}{4}$=$\frac{5}{6}$
15×$\frac{4}{5}$=
12
30÷$\frac{5}{6}$=36
$\frac{5}{12}+\frac{1}{9}$=$\frac{19}{36}$
$\frac{3}{4}-\frac{2}{3}$=
$\frac{1}{12}$
$\frac{6}{7}×\frac{7}{9}$=$\frac{2}{3}$
0.75÷$\frac{9}{8}$=$\frac{2}{3}$
答案
1. 0.32+2.88=3.2
2. 7.2÷1.8=4
3. 7.4×50=370
4. 125×8=1000
5. 3.8+1.12=4.92
6. 8×7.5=60
7. 2.45×0.4=0.98
8. 1.6-0.16=1.44
9. 1.64÷0.4=4.1
10. 420÷14=30
11. 750÷25=30
12. 1998÷9=222
13. 1-$\frac{4}{5}$=$\frac{1}{5}$
14. $\frac{4}{9}×\frac{6}{11}$=$\frac{8}{33}$
15. $\frac{1}{4}÷\frac{1}{2}$=$\frac{1}{2}$
16. 0.4+$\frac{5}{6}$=$\frac{37}{30}$
17. $\frac{5}{28}÷\frac{1}{7}$=$\frac{5}{4}$
18. $\frac{2}{3}×\frac{5}{4}$=$\frac{5}{6}$
19. 15×$\frac{4}{5}$=12
20. 30÷$\frac{5}{6}$=36
21. $\frac{5}{12}+\frac{1}{9}$=$\frac{19}{36}$
22. $\frac{3}{4}-\frac{2}{3}$=$\frac{1}{12}$
23. $\frac{6}{7}×\frac{7}{9}$=$\frac{2}{3}$
24. 0.75÷$\frac{9}{8}$=$\frac{2}{3}$
2. 7.2÷1.8=4
3. 7.4×50=370
4. 125×8=1000
5. 3.8+1.12=4.92
6. 8×7.5=60
7. 2.45×0.4=0.98
8. 1.6-0.16=1.44
9. 1.64÷0.4=4.1
10. 420÷14=30
11. 750÷25=30
12. 1998÷9=222
13. 1-$\frac{4}{5}$=$\frac{1}{5}$
14. $\frac{4}{9}×\frac{6}{11}$=$\frac{8}{33}$
15. $\frac{1}{4}÷\frac{1}{2}$=$\frac{1}{2}$
16. 0.4+$\frac{5}{6}$=$\frac{37}{30}$
17. $\frac{5}{28}÷\frac{1}{7}$=$\frac{5}{4}$
18. $\frac{2}{3}×\frac{5}{4}$=$\frac{5}{6}$
19. 15×$\frac{4}{5}$=12
20. 30÷$\frac{5}{6}$=36
21. $\frac{5}{12}+\frac{1}{9}$=$\frac{19}{36}$
22. $\frac{3}{4}-\frac{2}{3}$=$\frac{1}{12}$
23. $\frac{6}{7}×\frac{7}{9}$=$\frac{2}{3}$
24. 0.75÷$\frac{9}{8}$=$\frac{2}{3}$
二、计算下面各题，能简算的要简算。
$(\frac{2}{3} - \frac{5}{8} + \frac{1}{6}) ÷ \frac{1}{48}$
$(\frac{5}{6} + \frac{1}{2}) × (\frac{7}{8} + \frac{1}{2})$
$\frac{8}{9} × [ \frac{3}{4} - ( \frac{7}{16} - 0.25 ) ]$
$25.2 ÷ (12.6 - 8.4)$
$2.22 × 9.9 + 2.22 × 0.1$
$7.2 ÷ [ (8.2 - 6.7) × 0.6 ]$
$(\frac{2}{3} - \frac{5}{8} + \frac{1}{6}) ÷ \frac{1}{48}$
$(\frac{5}{6} + \frac{1}{2}) × (\frac{7}{8} + \frac{1}{2})$
$\frac{8}{9} × [ \frac{3}{4} - ( \frac{7}{16} - 0.25 ) ]$
$25.2 ÷ (12.6 - 8.4)$
$2.22 × 9.9 + 2.22 × 0.1$
$7.2 ÷ [ (8.2 - 6.7) × 0.6 ]$
答案
1. $(\frac{2}{3} - \frac{5}{8} + \frac{1}{6}) ÷ \frac{1}{48}$=10
2. $(\frac{5}{6} + \frac{1}{2}) × (\frac{7}{8} + \frac{1}{2})$=$\frac{11}{6}$
3. $\frac{8}{9} × [ \frac{3}{4} - ( \frac{7}{16} - 0.25 ) ]$=$\frac{1}{2}$
4. $25.2 ÷ (12.6 - 8.4)$=6
5. $2.22 × 9.9 + 2.22 × 0.1$=22.2
6. $7.2 ÷ [ (8.2 - 6.7) × 0.6 ]$=8
2. $(\frac{5}{6} + \frac{1}{2}) × (\frac{7}{8} + \frac{1}{2})$=$\frac{11}{6}$
3. $\frac{8}{9} × [ \frac{3}{4} - ( \frac{7}{16} - 0.25 ) ]$=$\frac{1}{2}$
4. $25.2 ÷ (12.6 - 8.4)$=6
5. $2.22 × 9.9 + 2.22 × 0.1$=22.2
6. $7.2 ÷ [ (8.2 - 6.7) × 0.6 ]$=8
