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用长8m的铝合金条制成如图形状的矩形窗框,使窗户的透光面积最大,那么这个窗户的最...
用长8m的铝合金条制成如图形状的矩形窗框,使窗户的透光面积最大,那么这个窗户的最大透光面积是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101624223160316/SYS201311031016242231603026_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101624223160316/SYS201311031016242231603026_ST/0.png)
m
2B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101624223160316/SYS201311031016242231603026_ST/1.png)
m
2C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101624223160316/SYS201311031016242231603026_ST/2.png)
m
2D.4m
2
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