题目内容
简便计算.
×
+
×
86×
.
解:①
×
+
×![](http://thumb.1010pic.com/pic5/latex/8.png)
=
×(
+
)
=
×![](http://thumb.1010pic.com/pic5/latex/168.png)
=
;
②86×![](http://thumb.1010pic.com/pic5/latex/22187.png)
=(85+1)×![](http://thumb.1010pic.com/pic5/latex/22187.png)
=85×
+1×![](http://thumb.1010pic.com/pic5/latex/22187.png)
=3+![](http://thumb.1010pic.com/pic5/latex/22187.png)
=3
.
分析:(1)①利用了乘法的分配律;
(2)②先把86分成85+1,然后利用乘法的分配律.
点评:这两道题主要考查了乘法的分配律的利用.
![](http://thumb.1010pic.com/pic5/latex/8.png)
![](http://thumb.1010pic.com/pic5/latex/927.png)
![](http://thumb.1010pic.com/pic5/latex/96.png)
![](http://thumb.1010pic.com/pic5/latex/8.png)
=
![](http://thumb.1010pic.com/pic5/latex/8.png)
![](http://thumb.1010pic.com/pic5/latex/927.png)
![](http://thumb.1010pic.com/pic5/latex/96.png)
=
![](http://thumb.1010pic.com/pic5/latex/8.png)
![](http://thumb.1010pic.com/pic5/latex/168.png)
=
![](http://thumb.1010pic.com/pic5/latex/3982.png)
②86×
![](http://thumb.1010pic.com/pic5/latex/22187.png)
=(85+1)×
![](http://thumb.1010pic.com/pic5/latex/22187.png)
=85×
![](http://thumb.1010pic.com/pic5/latex/22187.png)
![](http://thumb.1010pic.com/pic5/latex/22187.png)
=3+
![](http://thumb.1010pic.com/pic5/latex/22187.png)
=3
![](http://thumb.1010pic.com/pic5/latex/22187.png)
分析:(1)①利用了乘法的分配律;
(2)②先把86分成85+1,然后利用乘法的分配律.
点评:这两道题主要考查了乘法的分配律的利用.
![](http://thumb2018.1010pic.com/images/loading.gif)
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