如图,四边形ABCD为一梯形纸片,AB//CD,AD=BC,翻折纸片ABCD,使点A与点C重合,折痕为EF,已知CE垂直于AB(1求证EF//BD,(2)若AB =7,CD=3求线段EF的长.如可以见http://zhidao.baidu.com/question/165641105.html 里面的图
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![如图,四边形ABCD为一梯形纸片,AB//CD,AD=BC,翻折纸片ABCD,使点A与点C重合,折痕为EF,已知CE垂直于AB(1求证EF//BD,(2)若AB =7,CD=3求线段EF的长.如可以见http://zhidao.baidu.com/question/165641105.html 里面的图](/uploads/image/z/1530226-10-6.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E4%B8%BA%E4%B8%80%E6%A2%AF%E5%BD%A2%E7%BA%B8%E7%89%87%2CAB%2F%2FCD%2CAD%3DBC%2C%E7%BF%BB%E6%8A%98%E7%BA%B8%E7%89%87ABCD%2C%E4%BD%BF%E7%82%B9A%E4%B8%8E%E7%82%B9C%E9%87%8D%E5%90%88%2C%E6%8A%98%E7%97%95%E4%B8%BAEF%2C%E5%B7%B2%E7%9F%A5CE%E5%9E%82%E7%9B%B4%E4%BA%8EAB%281%E6%B1%82%E8%AF%81EF%2F%2FBD%2C%EF%BC%882%EF%BC%89%E8%8B%A5AB+%3D7%2CCD%3D3%E6%B1%82%E7%BA%BF%E6%AE%B5EF%E7%9A%84%E9%95%BF.%E5%A6%82%E5%8F%AF%E4%BB%A5%E8%A7%81http%3A%2F%2Fzhidao.baidu.com%2Fquestion%2F165641105.html+++%E9%87%8C%E9%9D%A2%E7%9A%84%E5%9B%BE)
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