1. 直接写出得数。
1.99+0.1=
2.8+0.47=
0.72×0.5=
1.6×0.5×0.2=
9.8-0.9=
1.5×0.4=
0.45×40=
0.25×0.8÷0.2=
4÷0.5=
6×1.7=
0.28÷0.4=
20-6.25×2=
7.2÷36=
8.1÷0.3=
0.65×0.2=
9.6÷0.8-1.3=
0.45÷0.03=
0.34÷0.17=
4.4÷0.11=
1÷0.2×0.3=
4.8×20=
3.03×0.3=
3.44÷0.2=
4-2÷0.8=
0.42÷0.2=
20.2+0.01=
0.6×0.7=
12.5×0.78×8=
1.7×0.8=
3.6÷0.3=
6.15÷3=
0.25+0.25÷5=

1. 2.09 3.27 0.36 0.16 8.9 0.6 18 1 8 10.2 0.7 7.5 0.2 27 0.13 10.7 15 2 40 1.5 96 0.909 17.2 1.5 2.1 20.21 0.42 78 1.36 12 2.05 0.3

1. 2.09
2. 3.27
3. 0.36
4. 0.16
5. 8.9
6. 0.6
7. 18
8. 1
9. 8
10. 10.2
11. 0.7
12. 7.5
13. 0.2
14. 27
15. 0.13
16. 10.7
17. 15
18. 2
19. 40
20. 1.5
21. 96
22. 0.909
23. 17.2
24. 1.5
25. 2.1
26. 20.21
27. 0.42
28. 78
29. 1.36
30. 12
31. 2.05
32. 0.3

2. 计算下面各题,能简算的要简算。
2.8×3.2+3.2×7.2
(45.9-32.7)÷0.8÷1.25
4.2×6.9+0.42
(5.6+0.32)÷0.8
4.5÷2.5×101-1.8
1.8×[(3.41-2.9)÷0.03]

2. 32 13.2 29.4 7.4 180 30.6

2.8×3.2+3.2×7.2
=3.2×(2.8+7.2)
=3.2×10
=32
(45.9-32.7)÷0.8÷1.25
=13.2÷(0.8×1.25)
=13.2÷1
=13.2
4.2×6.9+0.42
=4.2×6.9+4.2×0.1
=4.2×(6.9+0.1)
=4.2×7
=29.4
(5.6+0.32)÷0.8
=5.6÷0.8+0.32÷0.8
=7+0.4
=7.4
4.5÷2.5×101-1.8
=1.8×101-1.8
=1.8×(101-1)
=1.8×100
=180
1.8×[(3.41-2.9)÷0.03]
=1.8×[0.51÷0.03]
=1.8×17
=30.6

3. 下面是5月份两个小区四类垃圾质量情况的统计表,完成统计表。

3. (从上到下,从左到右)68.4 34.2 3.2 16 33.4 5.4 16.2

68.4 34.2 3.2 16 33.4 5.4 16.2