1 直接写出得数。
2.1 - 0.7 =
13.4 ÷ 100 =
5.5 × 0.2 =
9.9 ÷ 9 =
3.2 ÷ 2 =
0.37 + 6.3 =
9.6 ÷ 4 =
10.8 ÷ 6 =

2.1 - 0.7 = 1.4
13.4 ÷ 100 = 0.134
5.5 × 0.2 = 1.1
9.9 ÷ 9 = 1.1
3.2 ÷ 2 = 1.6
0.37 + 6.3 = 6.67
9.6 ÷ 4 = 2.4
10.8 ÷ 6 = 1.8

② 把下题的计算补充完整。

```
4. 5 5
________
2 ) 9. 1 0
8
--------
1 1
1 0
--------
1 0
1 0
--------
0
```
$9.1÷2=4.55$

3 用竖式计算，带 * 的用乘法验算。
$33.8 ÷ 5 =$
$77.6 ÷ 16 =$
$*89.5 ÷ 25 =$
$7.1 ÷ 5 =$
$*111.1 ÷ 22 =$
$128.7 ÷ 78 =$
B级

$33.8 ÷ 5 = 6.76$
```
6.76
5)33.80
30
----
3 8
3 5
----
30
30
----
0
```
$77.6 ÷ 16 = 4.85$
```
4.85
16)77.60
64
----
13 6
12 8
----
80
80
----
0
```
$*89.5 ÷ 25 = 3.58$
```
3.58
25)89.50
75
----
14 5
12 5
----
2 00
2 00
----
0
```
验算：
```
3.58
× 25
-------
17.90
71.6
-------
89.50
```
$7.1 ÷ 5 = 1.42$
```
1.42
5)7.10
5
----
2 1
2 0
----
10
10
----
0
```
$*111.1 ÷ 22 = 5.05$
```
5.05
22)111.10
110
----
1 10
1 10
----
0
```
验算：
```
5.05
× 22
-------
10.10
101.0
-------
111.10
```
$128.7 ÷ 78 = 1.65$
```
1.65
78)128.70
78
----
50 7
46 8
----
3 90
3 90
----
0
```