题目内容
.
解:
,
=
×(
+1
+
),
=
×
,
=
,
=1
.
分析:先把
写成
,再运用乘法的分配律进行计算,这样使计算更加简便.
点评:本题考查了学生能否灵活的分解数,把算式转化成能运用乘法的分配律进行计算.考查了学生的转化能力.
![](http://thumb.1010pic.com/pic5/latex/203630.png)
=
![](http://thumb.1010pic.com/pic5/latex/13.png)
![](http://thumb.1010pic.com/pic5/latex/365.png)
![](http://thumb.1010pic.com/pic5/latex/13.png)
![](http://thumb.1010pic.com/pic5/latex/13.png)
=
![](http://thumb.1010pic.com/pic5/latex/13.png)
![](http://thumb.1010pic.com/pic5/latex/3802.png)
=
![](http://thumb.1010pic.com/pic5/latex/24152.png)
=1
![](http://thumb.1010pic.com/pic5/latex/597.png)
分析:先把
![](http://thumb.1010pic.com/pic5/latex/96.png)
![](http://thumb.1010pic.com/pic5/latex/3569.png)
点评:本题考查了学生能否灵活的分解数,把算式转化成能运用乘法的分配律进行计算.考查了学生的转化能力.
![](http://thumb2018.1010pic.com/images/loading.gif)
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