已知三棱锥A-BCD中,∠BCD=90°,BC=CD=1,AB⊥平面BCD,∠ADB=60°,EF分别是AC,AD上的动点,且AE/AC=AF/AD=入(入属于0到1).1求,不论入为何值,总有平面BEF⊥平面ABC 2,当入为何值时,平面BEF⊥平面ACD
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![已知三棱锥A-BCD中,∠BCD=90°,BC=CD=1,AB⊥平面BCD,∠ADB=60°,EF分别是AC,AD上的动点,且AE/AC=AF/AD=入(入属于0到1).1求,不论入为何值,总有平面BEF⊥平面ABC 2,当入为何值时,平面BEF⊥平面ACD](/uploads/image/z/2522731-67-1.jpg?t=%E5%B7%B2%E7%9F%A5%E4%B8%89%E6%A3%B1%E9%94%A5A-BCD%E4%B8%AD%2C%E2%88%A0BCD%3D90%C2%B0%2CBC%3DCD%3D1%2CAB%E2%8A%A5%E5%B9%B3%E9%9D%A2BCD%2C%E2%88%A0ADB%3D60%C2%B0%2CEF%E5%88%86%E5%88%AB%E6%98%AFAC%2CAD%E4%B8%8A%E7%9A%84%E5%8A%A8%E7%82%B9%2C%E4%B8%94AE%2FAC%3DAF%2FAD%3D%E5%85%A5%EF%BC%88%E5%85%A5%E5%B1%9E%E4%BA%8E0%E5%88%B01%EF%BC%89.1%E6%B1%82%2C%E4%B8%8D%E8%AE%BA%E5%85%A5%E4%B8%BA%E4%BD%95%E5%80%BC%2C%E6%80%BB%E6%9C%89%E5%B9%B3%E9%9D%A2BEF%E2%8A%A5%E5%B9%B3%E9%9D%A2ABC+2%2C%E5%BD%93%E5%85%A5%E4%B8%BA%E4%BD%95%E5%80%BC%E6%97%B6%2C%E5%B9%B3%E9%9D%A2BEF%E2%8A%A5%E5%B9%B3%E9%9D%A2ACD)
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