题目内容
求未知数x.
![]() | ![]() ![]() |
解:根据题意可得:
(1)
x+5×0.6=12,
x+3=12,
x+3-3=12-3,
x=9,
x÷
=9÷
,
x=6;
(2)
x+
x=1.4,
x=1.4,
x÷
=1.4÷
,
x=1.2.
分析:(1)先计算5×0.6=3,等式的两边同时减去3,然后等式的两边同时除以
即可;
(2)先计算
x+
x=
x,然后等式的两边再同时除以
即可.
点评:本题主要考查解方程,根据等式的性质进行解答即可.
(1)
![](http://thumb.1010pic.com/pic5/latex/33.png)
![](http://thumb.1010pic.com/pic5/latex/33.png)
![](http://thumb.1010pic.com/pic5/latex/33.png)
![](http://thumb.1010pic.com/pic5/latex/33.png)
![](http://thumb.1010pic.com/pic5/latex/33.png)
![](http://thumb.1010pic.com/pic5/latex/33.png)
![](http://thumb.1010pic.com/pic5/latex/33.png)
x=6;
(2)
![](http://thumb.1010pic.com/pic5/latex/8.png)
![](http://thumb.1010pic.com/pic5/latex/155.png)
![](http://thumb.1010pic.com/pic5/latex/7580.png)
![](http://thumb.1010pic.com/pic5/latex/7580.png)
![](http://thumb.1010pic.com/pic5/latex/7580.png)
![](http://thumb.1010pic.com/pic5/latex/7580.png)
x=1.2.
分析:(1)先计算5×0.6=3,等式的两边同时减去3,然后等式的两边同时除以
![](http://thumb.1010pic.com/pic5/latex/33.png)
(2)先计算
![](http://thumb.1010pic.com/pic5/latex/8.png)
![](http://thumb.1010pic.com/pic5/latex/155.png)
![](http://thumb.1010pic.com/pic5/latex/7580.png)
![](http://thumb.1010pic.com/pic5/latex/7580.png)
点评:本题主要考查解方程,根据等式的性质进行解答即可.
![](http://thumb2018.1010pic.com/images/loading.gif)
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