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一、口算。
$0.17×0.4=$
$1.25×0.08=$
$2.05×3=$
$0.35×0.2=$
$0.33×0.5=$
$20×0.06=$
$0.3×3.4=$
$2.5×0.05=$
$0.17×0.4=$
0.068
$1.05×4=$4.2
$1.5×0.3=$0.45
$1.25×0.08=$
0.1
$2.8×0.5=$1.4
$3.25×10=$32.5
$2.05×3=$
6.15
$8×0.15=$1.2
$0.26×5=$1.3
$0.35×0.2=$
0.07
$0.05×8=$0.4
$0.81×0.3=$0.243
$0.33×0.5=$
0.165
$3.5×0.6=$2.1
$7.5×0.4=$3
$20×0.06=$
1.2
$4×0.15=$0.6
$0.4×2.6=$1.04
$0.3×3.4=$
1.02
$0.26×20=$5.2
$0.81×0.4=$0.324
$2.5×0.05=$
0.125
$1.02×0.2=$0.204
$2.5×0.6=$1.5
答案
一、0.068 4.2 0.45 0.1 1.4 32.5 6.15 1.2 1.3 0.07 0.4 0.243 0.165 2.1 3 1.2 0.6 1.04 1.02 5.2 0.324 0.125 0.204 1.5
二、用竖式计算。(得数保留两位小数)
$9.08×0.45$ $7.2×1.84$ $0.24×4.6$
$0.87×0.56$ $0.023×1.7$ $3.45×0.14$
$9.08×0.45$ $7.2×1.84$ $0.24×4.6$
$0.87×0.56$ $0.023×1.7$ $3.45×0.14$
答案
二、4.09 13.25 1.10 0.49 0.04 0.48
解析
$9.08×0.45$
```
9.08
× 0.45
------
4540
3632
------
4.0860
```
$\approx4.09$
$7.2×1.84$
```
1.84
× 7.2
------
368
1288
------
13.248
```
$\approx13.25$
$0.24×4.6$
```
4.6
×0.24
------
184
92
------
1.104
```
$\approx1.10$
$0.87×0.56$
```
0.87
×0.56
------
522
435
------
0.4872
```
$\approx0.49$
$0.023×1.7$
```
0.023
× 1.7
------
161
23
------
0.0391
```
$\approx0.04$
$3.45×0.14$
```
3.45
×0.14
------
1380
345
------
0.4830
```
$\approx0.48$
答案依次为：4.09；13.25；1.10；0.49；0.04；0.48
```
9.08
× 0.45
------
4540
3632
------
4.0860
```
$\approx4.09$
$7.2×1.84$
```
1.84
× 7.2
------
368
1288
------
13.248
```
$\approx13.25$
$0.24×4.6$
```
4.6
×0.24
------
184
92
------
1.104
```
$\approx1.10$
$0.87×0.56$
```
0.87
×0.56
------
522
435
------
0.4872
```
$\approx0.49$
$0.023×1.7$
```
0.023
× 1.7
------
161
23
------
0.0391
```
$\approx0.04$
$3.45×0.14$
```
3.45
×0.14
------
1380
345
------
0.4830
```
$\approx0.48$
答案依次为：4.09；13.25；1.10；0.49；0.04；0.48
