解:(1)
![](http://thumb.1010pic.com/pic5/latex/597.png)
x-
![](http://thumb.1010pic.com/pic5/latex/1302.png)
x=
![](http://thumb.1010pic.com/pic5/latex/597.png)
,
(
![](http://thumb.1010pic.com/pic5/latex/597.png)
-
![](http://thumb.1010pic.com/pic5/latex/1302.png)
)x=
![](http://thumb.1010pic.com/pic5/latex/597.png)
,
![](http://thumb.1010pic.com/pic5/latex/1302.png)
x=
![](http://thumb.1010pic.com/pic5/latex/597.png)
,
![](http://thumb.1010pic.com/pic5/latex/1302.png)
x×
![](http://thumb.1010pic.com/pic5/latex/5689.png)
=
![](http://thumb.1010pic.com/pic5/latex/597.png)
×
![](http://thumb.1010pic.com/pic5/latex/5689.png)
,
x=2;
(2)7.6-4x=3.6,
7.6-4x+4x=3.6+4x,
3.6+4x=7.6,
3.6+4x-3.6=7.6-3.6,
4x=4,
4x÷4=4÷4,
x=1;
(3)2
![](http://thumb.1010pic.com/pic5/latex/13.png)
:x=5:4,
5x=
![](http://thumb.1010pic.com/pic5/latex/259.png)
×4,
5x=10,
5x÷5=10÷5,
x=2.
分析:(1)先根据乘法分配律改写成(
![](http://thumb.1010pic.com/pic5/latex/597.png)
-
![](http://thumb.1010pic.com/pic5/latex/1302.png)
)x=
![](http://thumb.1010pic.com/pic5/latex/597.png)
,即
![](http://thumb.1010pic.com/pic5/latex/1302.png)
x=
![](http://thumb.1010pic.com/pic5/latex/597.png)
,再根据等式的性质,两边同乘
![](http://thumb.1010pic.com/pic5/latex/5689.png)
即可;
(2)根据等式的性质,两边同加上4x,得3.6+4x=7.6,两边同减去3.6,再同除以4即可;
(3)先根据比例的性质改写成5x=
![](http://thumb.1010pic.com/pic5/latex/259.png)
×4,再根据等式的性质,两边同除以5即可.
点评:在解方程时应根据等式的性质,即等式两边同加上、同减去、同乘上或同除以某一个数(0除外),等式的两边仍相等,同时注意“=”上下要对齐.