题目内容
解方程.![]() ![]() | x÷ ![]() ![]() | ![]() |
解:①
x=
,
x=
×
,
x=
;
②x÷
=
,
3x=
,
3x×
=
,
x=
;
③
-18=6,
x-18+18=6+18,
x=24,
x×
=24×
,
x=30.
分析:我们运用等式的性质进行解答,即,(1)等式的两边同时加上或减去相同的数,等式两边仍然相等.(2)等式的两边同时乘以或除以同一个不为0的数,等式两边仍然相等.
点评:运用等式的基本性质解方程,解方程的过程中注意等号要对齐.
![](http://thumb.1010pic.com/pic5/latex/1207.png)
![](http://thumb.1010pic.com/pic5/latex/5690.png)
![](http://thumb.1010pic.com/pic5/latex/517097.png)
![](http://thumb.1010pic.com/pic5/latex/5690.png)
![](http://thumb.1010pic.com/pic5/latex/524.png)
x=
![](http://thumb.1010pic.com/pic5/latex/8.png)
②x÷
![](http://thumb.1010pic.com/pic5/latex/8.png)
![](http://thumb.1010pic.com/pic5/latex/155.png)
3x=
![](http://thumb.1010pic.com/pic5/latex/155.png)
3x×
![](http://thumb.1010pic.com/pic5/latex/8.png)
![](http://thumb.1010pic.com/pic5/latex/251964.png)
x=
![](http://thumb.1010pic.com/pic5/latex/3592.png)
③
![](http://thumb.1010pic.com/pic5/latex/67653.png)
![](http://thumb.1010pic.com/pic5/latex/602.png)
![](http://thumb.1010pic.com/pic5/latex/602.png)
![](http://thumb.1010pic.com/pic5/latex/602.png)
![](http://thumb.1010pic.com/pic5/latex/1180.png)
![](http://thumb.1010pic.com/pic5/latex/1180.png)
x=30.
分析:我们运用等式的性质进行解答,即,(1)等式的两边同时加上或减去相同的数,等式两边仍然相等.(2)等式的两边同时乘以或除以同一个不为0的数,等式两边仍然相等.
点评:运用等式的基本性质解方程,解方程的过程中注意等号要对齐.
![](http://thumb2018.1010pic.com/images/loading.gif)
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