解:(1)1.5x-0.6×15=18,
1.5x-9=18,
1.5x-9+9=18+9,
1.5x÷1.5=27÷1.5,
x=18;
(2)
![](http://thumb.1010pic.com/pic5/latex/365.png)
:x=3:12,
3x=
![](http://thumb.1010pic.com/pic5/latex/365.png)
×12,
3x÷3=9÷3,
x=3;
(3)
![](http://thumb.1010pic.com/pic5/latex/13.png)
x+
![](http://thumb.1010pic.com/pic5/latex/168.png)
x=42,
![](http://thumb.1010pic.com/pic5/latex/7580.png)
x=42,
![](http://thumb.1010pic.com/pic5/latex/7580.png)
x×
![](http://thumb.1010pic.com/pic5/latex/9777.png)
=42×
![](http://thumb.1010pic.com/pic5/latex/9777.png)
,
x=36.
分析:(1)先化简,再根据等式的性质,在方程两边同时加上9,再除以1.5求解,
(2)先根据比例的基本性质,把原式转化为3x=
![](http://thumb.1010pic.com/pic5/latex/365.png)
×12,再根据等式的性质,在方程两边同时除以3求解,
(3)先化简,再根据等式的性质,在方程两边同时乘
![](http://thumb.1010pic.com/pic5/latex/9777.png)
求解.
点评:本题考查了学生根据等式的性质和比例的基本性质解方程的能力,注意等号对齐.