如图,AA'//BB'//CC'//DD',且AB=BC=CD,A'B'=B'C'=C'D',AA'=3/DD'=6,求BB'和CC'的长
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![如图,AA'//BB'//CC'//DD',且AB=BC=CD,A'B'=B'C'=C'D',AA'=3/DD'=6,求BB'和CC'的长](/uploads/image/z/3654231-15-1.jpg?t=%E5%A6%82%E5%9B%BE%2CAA%27%2F%2FBB%27%2F%2FCC%27%2F%2FDD%27%2C%E4%B8%94AB%3DBC%3DCD%2CA%27B%27%3DB%27C%27%3DC%27D%27%2CAA%27%3D3%2FDD%27%3D6%2C%E6%B1%82BB%27%E5%92%8CCC%27%E7%9A%84%E9%95%BF)
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