一、口算。(每题1分,共28分)
$3.1÷3.1=$
$0.12×6=$
$4.7-1.7=$
$8a + 2a=$
$2.35 + 5=$
$0.05×0.8=$
$1.23÷0.03=$
$6.4m - 0.5m=$
$0.37×10=$
$0.02^{2}=$
$4.52 - 3.5=$
$5x÷10=$
$1.3 + 2.6=$
$3.4×0.8=$
$87÷8.7=$
$0.8y×4=$
$0.32×0.2=$
$1.2÷0.8=$
$5.6÷0.7=$
$2a×6a=$
$0.36÷4=$
$0.15×3=$
$7.65 - 5.05=$
$7b÷2b=$
$0.045÷0.9=$
$0.52×0.4=$
$0.34 + 2.5=$
$9b - 7b=$
$3.1÷3.1=$
$0.12×6=$
$4.7-1.7=$
$8a + 2a=$
$2.35 + 5=$
$0.05×0.8=$
$1.23÷0.03=$
$6.4m - 0.5m=$
$0.37×10=$
$0.02^{2}=$
$4.52 - 3.5=$
$5x÷10=$
$1.3 + 2.6=$
$3.4×0.8=$
$87÷8.7=$
$0.8y×4=$
$0.32×0.2=$
$1.2÷0.8=$
$5.6÷0.7=$
$2a×6a=$
$0.36÷4=$
$0.15×3=$
$7.65 - 5.05=$
$7b÷2b=$
$0.045÷0.9=$
$0.52×0.4=$
$0.34 + 2.5=$
$9b - 7b=$
答案
1. 1
2. 0.72
3. 3
4. 10a
5. 7.35
6. 0.04
7. 41
8. 5.9m
9. 3.7
10. 0.0004
11. 1.02
12. 0.5x
13. 3.9
14. 2.72
15. 10
16. 3.2y
17. 0.064
18. 1.5
19. 8
20. 12a²
21. 0.09
22. 0.45
23. 2.6
24. 3.5
25. 0.05
26. 0.208
27. 2.84
28. 2b
2. 0.72
3. 3
4. 10a
5. 7.35
6. 0.04
7. 41
8. 5.9m
9. 3.7
10. 0.0004
11. 1.02
12. 0.5x
13. 3.9
14. 2.72
15. 10
16. 3.2y
17. 0.064
18. 1.5
19. 8
20. 12a²
21. 0.09
22. 0.45
23. 2.6
24. 3.5
25. 0.05
26. 0.208
27. 2.84
28. 2b
二、用竖式计算。(每题3分,共18分)
13.5×2.8=
50.9×4.2=
11.04÷2.3=
21.47÷1.9=
7.6×0.35=
57.6÷33≈
(得数保留两位小数)
13.5×2.8=
50.9×4.2=
11.04÷2.3=
21.47÷1.9=
7.6×0.35=
57.6÷33≈
(得数保留两位小数)
答案
1. 37.8
2. 213.78
3. 4.8
4. 11.3
5. 2.66
6. 1.75
2. 213.78
3. 4.8
4. 11.3
5. 2.66
6. 1.75
三、计算下面各题,怎样简便就怎样计算。(每题4分,共24分)
61.5×102
0.25×1.25×32
3.75×98+3.75+3.75
3.24×(5.32−1.52)
0.32×2.5+0.84÷4
24.75−6.15−8.85+13.25
61.5×102
0.25×1.25×32
3.75×98+3.75+3.75
3.24×(5.32−1.52)
0.32×2.5+0.84÷4
24.75−6.15−8.85+13.25
答案
1. 6273
2. 10
3. 375
4. 12.312
5. 1.01
6. 23
2. 10
3. 375
4. 12.312
5. 1.01
6. 23
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