在矩形ABCD中,AB=3,BC=9,把矩形ABCD沿对角线BD折叠,使点C与点F重合,BF交AD于点M,过点C作CE⊥BF于点E,交AD于点G,则MG的长=____(要过程)
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![在矩形ABCD中,AB=3,BC=9,把矩形ABCD沿对角线BD折叠,使点C与点F重合,BF交AD于点M,过点C作CE⊥BF于点E,交AD于点G,则MG的长=____(要过程)](/uploads/image/z/12529017-9-7.jpg?t=%E5%9C%A8%E7%9F%A9%E5%BD%A2ABCD%E4%B8%AD%2CAB%3D3%2CBC%3D9%2C%E6%8A%8A%E7%9F%A9%E5%BD%A2ABCD%E6%B2%BF%E5%AF%B9%E8%A7%92%E7%BA%BFBD%E6%8A%98%E5%8F%A0%2C%E4%BD%BF%E7%82%B9C%E4%B8%8E%E7%82%B9F%E9%87%8D%E5%90%88%2CBF%E4%BA%A4AD%E4%BA%8E%E7%82%B9M%2C%E8%BF%87%E7%82%B9C%E4%BD%9CCE%E2%8A%A5BF%E4%BA%8E%E7%82%B9E%2C%E4%BA%A4AD%E4%BA%8E%E7%82%B9G%2C%E5%88%99MG%E7%9A%84%E9%95%BF%3D____%28%E8%A6%81%E8%BF%87%E7%A8%8B%29)
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