1 给下面各题的积点上小数点。
0.08
× 0.6
------
48
0.105
×
0.5
------
525
0.17
× 0.03
------
51
0.08
× 0.6
------
48
0.105
×
------
525
0.17
× 0.03
------
51
答案
```
0.08
× 0.6
------
0.048
```
```
0.105
× 0.5
-------
0.0525
```
```
0.17
×0.03
------
0.0051
```
0.08
× 0.6
------
0.048
```
```
0.105
× 0.5
-------
0.0525
```
```
0.17
×0.03
------
0.0051
```
2 用竖式计算。
0.56 × 0.12 =
1.4 × 0.039 =
0.15 × 0.104 =
0.56 × 0.12 =
1.4 × 0.039 =
0.15 × 0.104 =
答案
```
0.56
× 0.12
-------
112
56
-------
0.0672
```
$0.56 × 0.12 = 0.0672$
```
1.4
×0.039
-------
126
42
-------
0.0546
```
$1.4 × 0.039 = 0.0546$
```
0.104
× 0.15
-------
520
104
-------
0.01560
```
$0.15 × 0.104 = 0.0156$
0.56
× 0.12
-------
112
56
-------
0.0672
```
$0.56 × 0.12 = 0.0672$
```
1.4
×0.039
-------
126
42
-------
0.0546
```
$1.4 × 0.039 = 0.0546$
```
0.104
× 0.15
-------
520
104
-------
0.01560
```
$0.15 × 0.104 = 0.0156$
3 判断下面的竖式是否正确。正确的在括号内打“√”;错误的在括号内打“×”,并改正。

()
改正:

()
改正:
()
改正:
()
改正:
答案
(×)
改正:
```
0. 5 7
× 0. 1 2
---------
1 1 4
5 7
---------
0. 0 6 8 4
```
(×)
改正:
```
3. 0 4
× 6. 5
---------
1 5 2 0
1 8 2 4
---------
1 9. 7 6 0
```
改正:
```
0. 5 7
× 0. 1 2
---------
1 1 4
5 7
---------
0. 0 6 8 4
```
(×)
改正:
```
3. 0 4
× 6. 5
---------
1 5 2 0
1 8 2 4
---------
1 9. 7 6 0
```
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