题目内容
用竖式计算(用“四舍五入”法精确到十分位).
(1)3.07×0.25
(2)7.05÷0.36
(3)2.55×3.12
(4)19.05÷0.16.
解:(1)3.07×0.25≈0.8;
![](http://thumb.1010pic.com/pic5/upload/201311/52850edb512d2.png)
(2)7.05÷0.36≈19.6;
![](http://thumb.1010pic.com/pic5/upload/201311/52850edb633a7.png)
(3)2.55×3.12≈8.0;
![](http://thumb.1010pic.com/pic5/upload/201311/52850edb7084f.png)
(4)19.05÷0.16≈119.1;
![](http://thumb.1010pic.com/pic5/upload/201311/52850edb8298a.png)
分析:根据小数乘法、除法的计算法则,直接列竖式计算,再根据商乘出数等于被除数,对除法进行验算.
点评:注意计算结果精确到十分位,要加上到百分位.
![](http://thumb.1010pic.com/pic5/upload/201311/52850edb512d2.png)
(2)7.05÷0.36≈19.6;
![](http://thumb.1010pic.com/pic5/upload/201311/52850edb633a7.png)
(3)2.55×3.12≈8.0;
![](http://thumb.1010pic.com/pic5/upload/201311/52850edb7084f.png)
(4)19.05÷0.16≈119.1;
![](http://thumb.1010pic.com/pic5/upload/201311/52850edb8298a.png)
分析:根据小数乘法、除法的计算法则,直接列竖式计算,再根据商乘出数等于被除数,对除法进行验算.
点评:注意计算结果精确到十分位,要加上到百分位.
![](http://thumb2018.1010pic.com/images/loading.gif)
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