题目内容
列竖式计算.
7.5÷28(保留一位小数.)
8÷70(精确到百分位.)
3.2÷0.23(保留三位小数.)
1.36×0.48(精确到百分位.)
0.42÷4.5(得数保留两位小数.)
0.382.0.13(得数保留两位小数.)
7.5÷28(保留一位小数.)
8÷70(精确到百分位.)
3.2÷0.23(保留三位小数.)
1.36×0.48(精确到百分位.)
0.42÷4.5(得数保留两位小数.)
0.382.0.13(得数保留两位小数.)
分析:根据小数乘除法的竖式计算方法进行解答,按要求求小数的近似值,要保留几位小数就要看它的下一位数,按照“四舍五入”法分别进行解答即可.
解答:解:(1)7.5÷28≈0.3;
![](http://thumb.1010pic.com/pic3/upload/images/201310/19/de49fbee.png)
(2)8÷70≈0.11;
![](http://thumb.1010pic.com/pic3/upload/images/201310/21/77961765.png)
(3)3.2÷0.23≈13.913;
(4)1.36×0.48≈0.65;
![](http://thumb.1010pic.com/pic3/upload/images/201310/19/9892c7ce.png)
(5)0.42÷4.5≈0.09;
![](http://thumb.1010pic.com/pic3/upload/images/201310/19/86e466ff.png)
(6)0.382÷0.13≈2.94.
![](http://thumb.1010pic.com/pic3/upload/images/201310/19/7ede3f53.png)
![](http://thumb.1010pic.com/pic3/upload/images/201310/19/de49fbee.png)
(2)8÷70≈0.11;
![](http://thumb.1010pic.com/pic3/upload/images/201310/21/77961765.png)
(3)3.2÷0.23≈13.913;
![](http://thumb.1010pic.com/pic3/upload/images/201310/19/0a0c6b73.png)
(4)1.36×0.48≈0.65;
![](http://thumb.1010pic.com/pic3/upload/images/201310/19/9892c7ce.png)
(5)0.42÷4.5≈0.09;
![](http://thumb.1010pic.com/pic3/upload/images/201310/19/86e466ff.png)
(6)0.382÷0.13≈2.94.
![](http://thumb.1010pic.com/pic3/upload/images/201310/19/7ede3f53.png)
点评:此题考查了小数乘除法的竖式计算方法及计算能力,注意用“四舍五入”法求近似数的方法.
![](http://thumb2018.1010pic.com/images/loading.gif)
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