题目内容
用竖式计算 285×36= |
25×308= | 18.9+25.12= | 60.8-20.9= |
分析:根据整数乘法和小数加减法的运算法则列竖式计算,即可得解.
解答:解:285×36=10260;
![](http://thumb.1010pic.com/pic3/upload/images/201312/39/62912f2b.png)
25×308=7700;
![](http://thumb.1010pic.com/pic3/upload/images/201312/39/a3270208.png)
18.9+25.12=44.02;
![](http://thumb.1010pic.com/pic3/upload/images/201312/39/0a131d25.png)
60.8-20.9=39.9.
![](http://thumb.1010pic.com/pic3/upload/images/201312/39/3f622c84.png)
![](http://thumb.1010pic.com/pic3/upload/images/201312/39/62912f2b.png)
25×308=7700;
![](http://thumb.1010pic.com/pic3/upload/images/201312/39/a3270208.png)
18.9+25.12=44.02;
![](http://thumb.1010pic.com/pic3/upload/images/201312/39/0a131d25.png)
60.8-20.9=39.9.
![](http://thumb.1010pic.com/pic3/upload/images/201312/39/3f622c84.png)
点评:此题考查笔算整数乘法和小数加减法,关键是熟悉运算法则,计算小数加减法时,要注意把小数点对齐,也就是把相同数位上的数对齐,进而计算得解.
![](http://thumb2018.1010pic.com/images/loading.gif)
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