1. 直接写得数。
$1-0.01=$
$0.8+4.7=$
$3.2-1.2=$
$6.9+3.12=$
$1.26÷100=$
$0.46×100=$
$4.68×1000=$
$0.68÷10=$
$1-0.01=$
$0.8+4.7=$
$3.2-1.2=$
$6.9+3.12=$
$1.26÷100=$
$0.46×100=$
$4.68×1000=$
$0.68÷10=$
答案
$1-0.01=0.99$
$0.8+4.7=5.5$
$3.2-1.2=2$
$6.9+3.12=10.02$
$1.26÷100=0.0126$
$0.46×100=46$
$4.68×1000=4680$
$0.68÷10=0.068$
$0.8+4.7=5.5$
$3.2-1.2=2$
$6.9+3.12=10.02$
$1.26÷100=0.0126$
$0.46×100=46$
$4.68×1000=4680$
$0.68÷10=0.068$
2. 用竖式计算并验算。
13.6+5.64=
27-10.49=
13.6+5.64=
27-10.49=
答案
13.6+5.64=19.24
竖式计算:
```
13.60
+ 5.64
--------
19.24
```
验算:
```
19.24
5.64
--------
13.60
```
---
27-10.49=16.51
竖式计算:
```
27.00
10.49
--------
16.51
```
验算:
```
16.51
+ 10.49
--------
27.00
```
竖式计算:
```
13.60
+ 5.64
--------
19.24
```
验算:
```
19.24
5.64
--------
13.60
```
---
27-10.49=16.51
竖式计算:
```
27.00
10.49
--------
16.51
```
验算:
```
16.51
+ 10.49
--------
27.00
```
3. 计算下面各题,怎样简便就怎样算。
66.5-23.5-16.5
54×99
92×26-11×92+15×8
66.5-23.5-16.5
54×99
92×26-11×92+15×8
答案
66.5-23.5-16.5
=66.5-16.5-23.5
=50-23.5
=26.5
54×99
=54×(100-1)
=54×100-54×1
=5400-54
=5346
92×26-11×92+15×8
=92×(26-11)+15×8
=92×15+15×8
=15×(92+8)
=15×100
=1500
=66.5-16.5-23.5
=50-23.5
=26.5
54×99
=54×(100-1)
=54×100-54×1
=5400-54
=5346
92×26-11×92+15×8
=92×(26-11)+15×8
=92×15+15×8
=15×(92+8)
=15×100
=1500
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