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梯形ABCD中,AD∥BC,AD=a,BC=b,EF∥AD交AB,CD于E,F,...
梯形ABCD中,AD∥BC,AD=a,BC=b,EF∥AD交AB,CD于E,F,且梯形AEFD与梯形EBCF相似,则EF等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102641741955771/SYS201311031026417419557011_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102641741955771/SYS201311031026417419557011_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102641741955771/SYS201311031026417419557011_ST/2.png)
D.不能确定
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