解:(1)7x-4.5=9.5,
7x-4.5+4.5=9.5+4.5,
7x=14,
7x÷7=14÷7,
x=2;
(2)x+
![](http://thumb.1010pic.com/pic5/latex/36.png)
x=
![](http://thumb.1010pic.com/pic5/latex/1114.png)
,
![](http://thumb.1010pic.com/pic5/latex/15.png)
x=
![](http://thumb.1010pic.com/pic5/latex/1114.png)
,
![](http://thumb.1010pic.com/pic5/latex/15.png)
x÷
![](http://thumb.1010pic.com/pic5/latex/15.png)
=
![](http://thumb.1010pic.com/pic5/latex/1114.png)
÷
![](http://thumb.1010pic.com/pic5/latex/15.png)
,
x=
![](http://thumb.1010pic.com/pic5/latex/335.png)
;
(3)
![](http://thumb.1010pic.com/pic5/latex/14.png)
:
![](http://thumb.1010pic.com/pic5/latex/9777.png)
=x:
![](http://thumb.1010pic.com/pic5/latex/1180.png)
,
![](http://thumb.1010pic.com/pic5/latex/9777.png)
x=
![](http://thumb.1010pic.com/pic5/latex/1180.png)
×
![](http://thumb.1010pic.com/pic5/latex/14.png)
,
![](http://thumb.1010pic.com/pic5/latex/9777.png)
x÷
![](http://thumb.1010pic.com/pic5/latex/9777.png)
=
![](http://thumb.1010pic.com/pic5/latex/1180.png)
×
![](http://thumb.1010pic.com/pic5/latex/14.png)
÷
![](http://thumb.1010pic.com/pic5/latex/9777.png)
,
x=
![](http://thumb.1010pic.com/pic5/latex/1180.png)
×
![](http://thumb.1010pic.com/pic5/latex/14.png)
×
![](http://thumb.1010pic.com/pic5/latex/7580.png)
,
x=
![](http://thumb.1010pic.com/pic5/latex/1207.png)
.
分析:(1)等式的两边同时加4.5,然后等式的两边再同时除以7即可;
(2)先计算x+
![](http://thumb.1010pic.com/pic5/latex/36.png)
x=
![](http://thumb.1010pic.com/pic5/latex/15.png)
x,然后等式的两边同时除以
![](http://thumb.1010pic.com/pic5/latex/15.png)
即可;
(3)根据比例的意义,两内项之积等于两外项之积,然后等式的两边同时除以
![](http://thumb.1010pic.com/pic5/latex/9777.png)
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.