几何代数:已知正方形ABCD与正方形ABEF所在平面互相垂直M为AC上一点,N为BF上一点,且AM=FN=x有,设AB=a(1) 求证:MN∥平面CBE;(2) 求证:MN⊥AB;(3) 当x为何值时,MN取最小值?并求出这个最小
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![几何代数:已知正方形ABCD与正方形ABEF所在平面互相垂直M为AC上一点,N为BF上一点,且AM=FN=x有,设AB=a(1) 求证:MN∥平面CBE;(2) 求证:MN⊥AB;(3) 当x为何值时,MN取最小值?并求出这个最小](/uploads/image/z/4538232-0-2.jpg?t=%E5%87%A0%E4%BD%95%E4%BB%A3%E6%95%B0%EF%BC%9A%E5%B7%B2%E7%9F%A5%E6%AD%A3%E6%96%B9%E5%BD%A2ABCD%E4%B8%8E%E6%AD%A3%E6%96%B9%E5%BD%A2ABEF%E6%89%80%E5%9C%A8%E5%B9%B3%E9%9D%A2%E4%BA%92%E7%9B%B8%E5%9E%82%E7%9B%B4M%E4%B8%BAAC%E4%B8%8A%E4%B8%80%E7%82%B9%2CN%E4%B8%BABF%E4%B8%8A%E4%B8%80%E7%82%B9%2C%E4%B8%94AM%3DFN%3Dx%E6%9C%89%2C%E8%AE%BEAB%3Da%EF%BC%881%EF%BC%89+%E6%B1%82%E8%AF%81%EF%BC%9AMN%E2%88%A5%E5%B9%B3%E9%9D%A2CBE%EF%BC%9B%EF%BC%882%EF%BC%89+%E6%B1%82%E8%AF%81%EF%BC%9AMN%E2%8A%A5AB%EF%BC%9B%EF%BC%883%EF%BC%89+%E5%BD%93x%E4%B8%BA%E4%BD%95%E5%80%BC%E6%97%B6%2CMN%E5%8F%96%E6%9C%80%E5%B0%8F%E5%80%BC%3F%E5%B9%B6%E6%B1%82%E5%87%BA%E8%BF%99%E4%B8%AA%E6%9C%80%E5%B0%8F)
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