解:(1)25%x=75,
25%x÷25%=75÷25%,
x=300,
(2)60%x-35%x=125,
25%x=125,
25%x÷25%=125÷25%,
x=500,
(3)
![](http://thumb.1010pic.com/pic5/latex/96.png)
x+
![](http://thumb.1010pic.com/pic5/latex/8.png)
x=3.5,
![](http://thumb.1010pic.com/pic5/latex/341751.png)
=3.5,
![](http://thumb.1010pic.com/pic5/latex/341751.png)
×
![](http://thumb.1010pic.com/pic5/latex/10141.png)
=3.5×
![](http://thumb.1010pic.com/pic5/latex/10141.png)
,
x=6.
分析:(1)根据等式的性质,两边同时除以25%即可;
(2)先把左边计算出来得25%x-125,再根据等式的性质,两边同时除以25%即可;
(3)先把左边计算出来得:
![](http://thumb.1010pic.com/pic5/latex/341751.png)
=3.5,在根据等式的性质两边同时乘
![](http://thumb.1010pic.com/pic5/latex/10141.png)
即可.
点评:此题考查利用等式的性质解方程的灵活应用.