1. 直接写出得数。
0.6×0.7=
0.31×0.4=
1.6×0.4=
0.1×29×0.2=
2.5×8=
25×0.01=
0.7×1.1=
4.8÷3×0.1=
2.3×4=
1.8×0.2=
20×0.03=
5.2×0.4×10=
0.25×0.4=
1.2×0.7=
15×0.08=
300×0.5÷5=
3.7×0.1=
0.15×2=
5.1×0.3=
2.8×0.2÷2=
1.2×0.3=
0.02×4.5=
0.26×20=
6.4×3×0.1=
5.1×0.4=
2.6×0.3=
1.02×0.2=
0.4×5×2.8=
8.5×0.8=
1.5×0.6=
0.33×0.5=
0.72×10×0.01=
0.6×0.7=
0.42
0.31×0.4=
0.124
1.6×0.4=
0.64
0.1×29×0.2=
0.58
2.5×8=
20
25×0.01=
0.25
0.7×1.1=
0.77
4.8÷3×0.1=
0.16
2.3×4=
9.2
1.8×0.2=
0.36
20×0.03=
0.6
5.2×0.4×10=
20.8
0.25×0.4=
0.1
1.2×0.7=
0.84
15×0.08=
1.2
300×0.5÷5=
30
3.7×0.1=
0.37
0.15×2=
0.3
5.1×0.3=
1.53
2.8×0.2÷2=
0.28
1.2×0.3=
0.36
0.02×4.5=
0.09
0.26×20=
5.2
6.4×3×0.1=
1.92
5.1×0.4=
2.04
2.6×0.3=
0.78
1.02×0.2=
0.204
0.4×5×2.8=
5.6
8.5×0.8=
6.8
1.5×0.6=
0.9
0.33×0.5=
0.165
0.72×10×0.01=
0.072
答案
0.42 0.124 0.64 0.58 20 0.25 0.77 0.16 9.2 0.36 0.6 20.8 0.1 0.84 1.2 30 0.37 0.3 1.53 0.28 0.36 0.09 5.2 1.92 2.04 0.78 0.204 5.6 6.8 0.9 0.165 0.072
2. 用竖式计算。(第一行得数保留一位小数,第二行得数保留两位小数)
5.6×0.08≈
0.73×3.8≈
3.78×1.2≈
2.8×3.67≈
1.56×0.73≈
6.23×0.15≈
竖式略
5.6×0.08≈
0.4
0.73×3.8≈
2.8
3.78×1.2≈
4.5
2.8×3.67≈
10.28
1.56×0.73≈
1.14
6.23×0.15≈
0.93
竖式略
答案
0.4 2.8 4.5 10.28 1.14 0.93 竖式略
解析
5.6×0.08≈0.4
```
5.6
×0.08
----
0.448
```
0.73×3.8≈2.8
```
0.73
× 3.8
----
584
219
----
2.774
```
3.78×1.2≈4.5
```
3.78
× 1.2
----
756
378
----
4.536
```
2.8×3.67≈10.28
```
3.67
× 2.8
----
2936
734
----
10.276
```
1.56×0.73≈1.14
```
1.56
×0.73
----
468
1092
----
1.1388
```
6.23×0.15≈0.93
```
6.23
×0.15
----
3115
623
----
0.9345
```
```
5.6
×0.08
----
0.448
```
0.73×3.8≈2.8
```
0.73
× 3.8
----
584
219
----
2.774
```
3.78×1.2≈4.5
```
3.78
× 1.2
----
756
378
----
4.536
```
2.8×3.67≈10.28
```
3.67
× 2.8
----
2936
734
----
10.276
```
1.56×0.73≈1.14
```
1.56
×0.73
----
468
1092
----
1.1388
```
6.23×0.15≈0.93
```
6.23
×0.15
----
3115
623
----
0.9345
```
(1)2.43×2.2□2≈6,□里可以填(
(2)若□.□5×□.5≈16.13,则这道算式的积四舍五入前应是(
(3)一个两位小数乘16的积精确到个位后是65,这个两位小数最大是(
7、8、9
)。(2)若□.□5×□.5≈16.13,则这道算式的积四舍五入前应是(
16.125
)。(3)一个两位小数乘16的积精确到个位后是65,这个两位小数最大是(
4.09
)。答案
(1)7、8、9
(2)16.125
(3)4.09
登录