如图,四边形ABCD为一梯形纸片,AB∥CD,AD=BC翻折纸片abcd,使A与C重合,折痕为EF,已知CE⊥AB1.求证EF∥BD2.若AB=7,CD=3,求线段EF长如图,四边形ABCD为一梯形纸片,AB∥CD,AD=BC翻折纸片abcd,使A与C重合,折
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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A与C重合,折痕为EF,已知CE⊥AB1.求证EF∥BD2.若AB=7,CD=3,求线段EF长如图,四边形ABCD为一梯形纸片,AB∥CD,AD=BC翻折纸片abcd,使A与C重合,折](/uploads/image/z/5046991-7-1.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%E2%88%A5CD%2CAD%3DBC%E7%BF%BB%E6%8A%98%E7%BA%B8%E7%89%87abcd%2C%E4%BD%BFA%E4%B8%8EC%E9%87%8D%E5%90%88%2C%E6%8A%98%E7%97%95%E4%B8%BAEF%2C%E5%B7%B2%E7%9F%A5CE%E2%8A%A5AB1.%E6%B1%82%E8%AF%81EF%E2%88%A5BD2.%E8%8B%A5AB%3D7%2CCD%3D3%2C%E6%B1%82%E7%BA%BF%E6%AE%B5EF%E9%95%BF%E5%A6%82%E5%9B%BE%EF%BC%8C%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%EF%BC%8CAB%E2%88%A5CD%EF%BC%8CAD%3DBC%E7%BF%BB%E6%8A%98%E7%BA%B8%E7%89%87abcd%EF%BC%8C%E4%BD%BFA%E4%B8%8EC%E9%87%8D%E5%90%88%EF%BC%8C%E6%8A%98)
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