题目内容
用竖式计算 23.9-9.9= |
33×12= |
63×27= | 81×29= |
3.5+4.0= | 12.6+3.2= | 52×49= | 5.4-3.6= |
分析:①⑤⑥⑧有关小数的加减法的题目,列竖式时要把小数点对齐进行计算即可.②③④⑦运用整数的乘法的计算法则进行计算.
解答:解:①23.9-9.9=14;
![](http://thumb.1010pic.com/pic3/upload/images/201211/22/3100df40.png)
②33×12=396;
![](http://thumb.1010pic.com/pic3/upload/images/201211/22/e7a35180.png)
③63×27=1701;
![](http://thumb.1010pic.com/pic3/upload/images/201211/22/7c32a8a6.png)
④81×29=2349;
![](http://thumb.1010pic.com/pic3/upload/images/201211/22/7898e2b2.png)
⑤3.5+4.0═7.5;
![](http://thumb.1010pic.com/pic3/upload/images/201211/22/d495695b.png)
⑥12.6+3.2=15.8;
![](http://thumb.1010pic.com/pic3/upload/images/201211/22/18a2bb5f.png)
⑦52×49=2548;
![](http://thumb.1010pic.com/pic3/upload/images/201211/22/bf7b43d3.png)
⑧5.4-3.6=1.8;
![](http://thumb.1010pic.com/pic3/upload/images/201211/22/ea7194e8.png)
![](http://thumb.1010pic.com/pic3/upload/images/201211/22/3100df40.png)
②33×12=396;
![](http://thumb.1010pic.com/pic3/upload/images/201211/22/e7a35180.png)
③63×27=1701;
![](http://thumb.1010pic.com/pic3/upload/images/201211/22/7c32a8a6.png)
④81×29=2349;
![](http://thumb.1010pic.com/pic3/upload/images/201211/22/7898e2b2.png)
⑤3.5+4.0═7.5;
![](http://thumb.1010pic.com/pic3/upload/images/201211/22/d495695b.png)
⑥12.6+3.2=15.8;
![](http://thumb.1010pic.com/pic3/upload/images/201211/22/18a2bb5f.png)
⑦52×49=2548;
![](http://thumb.1010pic.com/pic3/upload/images/201211/22/bf7b43d3.png)
⑧5.4-3.6=1.8;
![](http://thumb.1010pic.com/pic3/upload/images/201211/22/ea7194e8.png)
点评:本题考查了小数的加减法的计算法则及整数乘法的计算法则,考查了学生的计算能力.
![](http://thumb2018.1010pic.com/images/loading.gif)
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