题目内容
脱式计算,能简算的要简算.
2.79×4.64+2.79×4.36+2.79
45.45÷9÷5
+
-
+
.
解:(1)2.79×4.64+2.79×4.36+2.79, =2.79×(4.64+4.36+1), =2.79×10, | ||
=27.9; | ||
(2)45.45÷9÷5, |
=45.45÷45,
=1.01;
(3)
![](http://thumb.1010pic.com/pic5/latex/168.png)
![](http://thumb.1010pic.com/pic5/latex/4442.png)
![](http://thumb.1010pic.com/pic5/latex/168.png)
![](http://thumb.1010pic.com/pic5/latex/4442.png)
=(
![](http://thumb.1010pic.com/pic5/latex/168.png)
![](http://thumb.1010pic.com/pic5/latex/168.png)
![](http://thumb.1010pic.com/pic5/latex/4442.png)
![](http://thumb.1010pic.com/pic5/latex/4442.png)
=
![](http://thumb.1010pic.com/pic5/latex/730.png)
分析:(1)运用乘法分配律简算;
(2)运用除法的性质简算;
(3)运用加法交换律与结合律简算.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
![](http://thumb2018.1010pic.com/images/loading.gif)
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