题目内容
用竖式计算.
7.4+12.86= | 20-5.674= | 141.2-48.98= |
102+4.36= | 32.15-27.45=验算: | 12.9+5.01=验算: |
解:(1)7.4+12.86=20.26;
![](http://thumb.1010pic.com/pic5/upload/201305/51d62ad1429b8.png)
(2)20-5.674=14.326;
![](http://thumb.1010pic.com/pic5/upload/201305/51d62ad16327c.png)
(3)141.2-48.98=92.22;
![](http://thumb.1010pic.com/pic5/upload/201305/51d62ad183cd7.png)
(4)102+4.36=106.36;
![](http://thumb.1010pic.com/pic5/upload/201305/51d62ad1a558c.png)
(5)32.15-27.45=4.7;
![](http://thumb.1010pic.com/pic5/upload/201305/51d62ad1c6da3.png)
验算:
![](http://thumb.1010pic.com/pic5/upload/201305/51d62ad1e775c.png)
(6)12.9+5.01=17.91;
![](http://thumb.1010pic.com/pic5/upload/201305/51d62ad213947.png)
验算:
![](http://thumb.1010pic.com/pic5/upload/201305/51d62ad233cae.png)
分析:根据小数加减法竖式计算的方法进行计算即可.减法用加法进行验算,加法用减法进行验算.
点评:本题主要考查小数加减法的笔算,按照各自的计算法则进行计算即可.
![](http://thumb.1010pic.com/pic5/upload/201305/51d62ad1429b8.png)
(2)20-5.674=14.326;
![](http://thumb.1010pic.com/pic5/upload/201305/51d62ad16327c.png)
(3)141.2-48.98=92.22;
![](http://thumb.1010pic.com/pic5/upload/201305/51d62ad183cd7.png)
(4)102+4.36=106.36;
![](http://thumb.1010pic.com/pic5/upload/201305/51d62ad1a558c.png)
(5)32.15-27.45=4.7;
![](http://thumb.1010pic.com/pic5/upload/201305/51d62ad1c6da3.png)
验算:
![](http://thumb.1010pic.com/pic5/upload/201305/51d62ad1e775c.png)
(6)12.9+5.01=17.91;
![](http://thumb.1010pic.com/pic5/upload/201305/51d62ad213947.png)
验算:
![](http://thumb.1010pic.com/pic5/upload/201305/51d62ad233cae.png)
分析:根据小数加减法竖式计算的方法进行计算即可.减法用加法进行验算,加法用减法进行验算.
点评:本题主要考查小数加减法的笔算,按照各自的计算法则进行计算即可.
![](http://thumb2018.1010pic.com/images/loading.gif)
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