1. 直接写出得数。
4.6+3.8=
0.36÷3=
9.8-0.98=
1.03+0.5-0.07=
10-0.7=
1.98×100=
0.12÷0.2=
7.2÷1.2÷0.3=
5.5-0.9=
1.38÷0.6=
2.1÷0.03=
7.2+2.8÷0.1=
1.8×5=
4.8÷0.4=
2.4×25=
6.1×99+6.1=
8.4÷0.4=
1.6÷0.8=
3.8×0.3=
0.125×9×0.8=
8÷0.5=
6.8÷17=
16.9÷1.3=
(4.5+6.3)÷0.2=
7.7÷1.1=
15×0.3=
70×0.07=
5.5÷0.5-1.8=
0.6×0.2=
2.3×0.2=
0.74×0.5=
3.2-4.6×0.5=

8.4 0.12 8.82 1.46 9.3 198 0.6 20 4.6 2.3 70 35.2 9 12 60 610 21 2 1.14 0.9 16 0.4 13 54 7 4.5 4.9 9.2 0.12 0.46 0.37 0.9

2. 用竖式计算,带☆的要验算。
1.05×0.72=
☆162.5÷65=
1.768÷0.26=
0.072×5.8=
4.7×1.25=
0.48÷2.3≈
(得数精确到百分位)

0.756 2.5 6.8 0.4176 5.875 0.21 竖式及验算略

```
1.05×0.72=0.756
```
```
1.05
×0.72
------
210
735
------
0.7560
```
```
☆162.5÷65=2.5
```
```
2.5
65)162.5
130
---
325
325
---
0
```
验算：
```
65
×2.5
----
325
130
----
162.5
```
```
1.768÷0.26=6.8
```
```
6.8
26)176.8
156
---
208
208
---
0
```
```
0.072×5.8=0.4176
```
```
0.072
× 5.8
------
576
360
------
0.4176
```
```
4.7×1.25=5.875
```
```
4.7
×1.25
------
235
94
47
------
5.875
```
```
0.48÷2.3≈0.21
```
```
0.208
23)0.4800
46
---
200
184
---
160
```
（精确到百分位，四舍五入得 0.21）

在0.□×□= 1.6中,每个方框里填一个数字,符合要求的填法一共有种,把它们一一列举出来。

3 0.2×8=1.6 0.4×4=1.6 0.8×2=1.6