<div style="width:875px">
                <div   align=left   style=   "border:0px   solid   green;width:20px;float:left;"> </div> 
                <div   align=center   style=   "border:0px   solid   green;width:800px;float:left;"> </div> 
                <div   align=right   style=   "width:150px;float:right;"> </div> 
</div

------解决方案--------------------
最好在外面也放一个div
HTML code

<div style="width:975px">
                <div   align=left   style=   "border:0px   solid   green;width:20px;float:left;"> </div> 
                <div   align=center   style=   "border:0px   solid   green;width:800px;float:left;"> </div> 
                <div   align=right   style=   "width:150px;float:right;"> </div> 
</div

------解决方案--------------------
 <div  style="border:1px solid green;width:20px;float:left;background:red">a</div>  
<div style="border:1px solid green;width:300px;float:left;background:green">def</div>  
<div  style="width:150px;background:blue;">ghgh</div>  
强烈建议CSDN改掉这个随便插空格的愚蠢透顶的BUG

------解决方案--------------------
[code=html] 
 [color=red] <div style="float:left">[/color] 
  <div style= "border:0px solid green;width:20px;[color=red]float:left[/color]">  </div> 
  <div style="border:0px solid green;width:800px;[color=red]float:right[/color]">  </div> 
 [color=red] </div>[/color] 
  <div style="width:150px;[color=red]float:right[/color]">  </div> 
 [/code]

------解决方案--------------------
HTML code

<div style="float:left;">12</div>
<div style="float:left;">12</div>
<div style="float:left;">12</div>

------解决方案--------------------
HTML code
 
[color=RED] <div   style="float:left"> [/color] 
<div   style=   "border:0px   solid   green;width:20px;[color=RED]float:left[/color]">   </div> 
<div   style="border:0px   solid   green;width:800px;[color=RED]float:right[/color]">   </div> 
[color=RED] </div> [/color] 
<div   style="width:150px;[color=RED]float:right[/color]">   </div>

------解决方案--------------------
建个一行三列的table  每列嵌个div

------解决方案--------------------
<div   style="float:left">
<div   style=   "border:1px   solid   green;">fdasfdaf</div>  
<div   style="border:1px   solid   green;"> fdafda</div> 
<div   style="border:1px   solid   green;"> fdsafdaf   </div>  
</div>


------解决方案--------------------