直三棱柱ABC-A1B1C1中,AB=5,AC=4,BC=3,AA1=4,D是AB的中点 当BD/AB=1/3是,求二面角B—CD—B1的余弦值直三棱柱ABC-A1B1C1中,AB=5,AC=4,BC=3,AA1=4,D是AB的中点 当BD/AB=1/3是,求二面角B—CD—B1的余弦值 用及合法做,向
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![直三棱柱ABC-A1B1C1中,AB=5,AC=4,BC=3,AA1=4,D是AB的中点 当BD/AB=1/3是,求二面角B—CD—B1的余弦值直三棱柱ABC-A1B1C1中,AB=5,AC=4,BC=3,AA1=4,D是AB的中点 当BD/AB=1/3是,求二面角B—CD—B1的余弦值 用及合法做,向](/uploads/image/z/11560062-30-2.jpg?t=%E7%9B%B4%E4%B8%89%E6%A3%B1%E6%9F%B1ABC-A1B1C1%E4%B8%AD%2CAB%3D5%2CAC%3D4%2CBC%3D3%2CAA1%3D4%2CD%E6%98%AFAB%E7%9A%84%E4%B8%AD%E7%82%B9+%E5%BD%93BD%2FAB%3D1%2F3%E6%98%AF%2C%E6%B1%82%E4%BA%8C%E9%9D%A2%E8%A7%92B%E2%80%94CD%E2%80%94B1%E7%9A%84%E4%BD%99%E5%BC%A6%E5%80%BC%E7%9B%B4%E4%B8%89%E6%A3%B1%E6%9F%B1ABC-A1B1C1%E4%B8%AD%2CAB%3D5%2CAC%3D4%2CBC%3D3%2CAA1%3D4%2CD%E6%98%AFAB%E7%9A%84%E4%B8%AD%E7%82%B9+%E5%BD%93BD%2FAB%3D1%2F3%E6%98%AF%2C%E6%B1%82%E4%BA%8C%E9%9D%A2%E8%A7%92B%E2%80%94CD%E2%80%94B1%E7%9A%84%E4%BD%99%E5%BC%A6%E5%80%BC+%E7%94%A8%E5%8F%8A%E5%90%88%E6%B3%95%E5%81%9A%2C%E5%90%91)
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