如图,在矩形ABCD中,点E,F在边AD上,AE=EF=FD,CE,CF分别与BD交与点M,N,已知AB=12cm,BC=16cm,求MN的长http://pic.wenwen.soso.com/p/20100924/20100924134507-1076852501.jpg
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![如图,在矩形ABCD中,点E,F在边AD上,AE=EF=FD,CE,CF分别与BD交与点M,N,已知AB=12cm,BC=16cm,求MN的长http://pic.wenwen.soso.com/p/20100924/20100924134507-1076852501.jpg](/uploads/image/z/3579025-49-5.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E7%9F%A9%E5%BD%A2ABCD%E4%B8%AD%2C%E7%82%B9E%2CF%E5%9C%A8%E8%BE%B9AD%E4%B8%8A%2CAE%3DEF%3DFD%2CCE%2CCF%E5%88%86%E5%88%AB%E4%B8%8EBD%E4%BA%A4%E4%B8%8E%E7%82%B9M%2CN%2C%E5%B7%B2%E7%9F%A5AB%3D12cm%2CBC%3D16cm%2C%E6%B1%82MN%E7%9A%84%E9%95%BFhttp%3A%2F%2Fpic.wenwen.soso.com%2Fp%2F20100924%2F20100924134507-1076852501.jpg)
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