题目内容
运用简便方法计算.
![]() ![]() ![]() | ![]() ![]() ![]() | (5+![]() | ![]() ![]() | 3-1÷(![]() ![]() ![]() |
解:(1)![]() ![]() ![]() |
![](http://thumb.1010pic.com/pic5/latex/168.png)
![](http://thumb.1010pic.com/pic5/latex/313612.png)
![](http://thumb.1010pic.com/pic5/latex/14.png)
=6;
(2)
![](http://thumb.1010pic.com/pic5/latex/5882.png)
![](http://thumb.1010pic.com/pic5/latex/847.png)
![](http://thumb.1010pic.com/pic5/latex/1072.png)
=(
![](http://thumb.1010pic.com/pic5/latex/5882.png)
![](http://thumb.1010pic.com/pic5/latex/1072.png)
![](http://thumb.1010pic.com/pic5/latex/847.png)
=1×
![](http://thumb.1010pic.com/pic5/latex/847.png)
=
![](http://thumb.1010pic.com/pic5/latex/847.png)
(3)(5+
![](http://thumb.1010pic.com/pic5/latex/5139.png)
=10×5+
![](http://thumb.1010pic.com/pic5/latex/5139.png)
=50
![](http://thumb.1010pic.com/pic5/latex/335.png)
(4)
![](http://thumb.1010pic.com/pic5/latex/2579.png)
![](http://thumb.1010pic.com/pic5/latex/2579.png)
=
![](http://thumb.1010pic.com/pic5/latex/2579.png)
=
![](http://thumb.1010pic.com/pic5/latex/2579.png)
=
![](http://thumb.1010pic.com/pic5/latex/5886.png)
(5)3-1÷(
![](http://thumb.1010pic.com/pic5/latex/4579.png)
![](http://thumb.1010pic.com/pic5/latex/4579.png)
![](http://thumb.1010pic.com/pic5/latex/35.png)
=3-1÷(
![](http://thumb.1010pic.com/pic5/latex/4579.png)
![](http://thumb.1010pic.com/pic5/latex/4579.png)
![](http://thumb.1010pic.com/pic5/latex/35.png)
=3-1÷(
![](http://thumb.1010pic.com/pic5/latex/4579.png)
=3-1÷
![](http://thumb.1010pic.com/pic5/latex/190.png)
=3-
![](http://thumb.1010pic.com/pic5/latex/3982.png)
=2
![](http://thumb.1010pic.com/pic5/latex/764.png)
分析:(1)、(5)我们运用四则混合运算的顺序进行计算即可.
(2)、(3)、(4)运用乘法的分配律进行计算即可.
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算
![](http://thumb2018.1010pic.com/images/loading.gif)
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