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如图,已知:DE∥BC,AB=14,AC=18,AE=10,则AD的长为( ) ...
如图,已知:DE∥BC,AB=14,AC=18,AE=10,则AD的长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101342318435671/SYS201311031013423184356009_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101342318435671/SYS201311031013423184356009_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101342318435671/SYS201311031013423184356009_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101342318435671/SYS201311031013423184356009_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101342318435671/SYS201311031013423184356009_ST/3.png)
考点分析:
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1,S
2,S
3,则S
l:S
2:S
3=( )
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如图,在△ABC中,DE∥BC,若
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如图,已知平行四边形ABCD中,E是AB边的中点,DE交AC于点F,AC、DE把它分成的四部分的面积分别为S
1S
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4,下面结论:
①只有一对相似三角形
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③S
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如图,将一个大三角形剪成一个小三角形及一个梯形.若梯形上、下底的长分别为6,14,两腰长为12,16,则剪出的小三角形是( )
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D.
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