如图三棱柱ABC~A1B1C1的侧棱AA1垂直底面ABC,角ABC等于90度,E是棱CC1上的动点,F是AB中点,AC等于1,BC等于2,AA1等于4.求,1,放E是棱CC1中点时,求证CF平行于平面AEB1.2,在棱CC1上是否存在点E,使得二面角A—EB1
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![如图三棱柱ABC~A1B1C1的侧棱AA1垂直底面ABC,角ABC等于90度,E是棱CC1上的动点,F是AB中点,AC等于1,BC等于2,AA1等于4.求,1,放E是棱CC1中点时,求证CF平行于平面AEB1.2,在棱CC1上是否存在点E,使得二面角A—EB1](/uploads/image/z/9499641-33-1.jpg?t=%E5%A6%82%E5%9B%BE%E4%B8%89%E6%A3%B1%E6%9F%B1ABC%7EA1B1C1%E7%9A%84%E4%BE%A7%E6%A3%B1AA1%E5%9E%82%E7%9B%B4%E5%BA%95%E9%9D%A2ABC%2C%E8%A7%92ABC%E7%AD%89%E4%BA%8E90%E5%BA%A6%2CE%E6%98%AF%E6%A3%B1CC1%E4%B8%8A%E7%9A%84%E5%8A%A8%E7%82%B9%2CF%E6%98%AFAB%E4%B8%AD%E7%82%B9%2CAC%E7%AD%89%E4%BA%8E1%2CBC%E7%AD%89%E4%BA%8E2%2CAA1%E7%AD%89%E4%BA%8E4.%E6%B1%82%2C1%2C%E6%94%BEE%E6%98%AF%E6%A3%B1CC1%E4%B8%AD%E7%82%B9%E6%97%B6%2C%E6%B1%82%E8%AF%81CF%E5%B9%B3%E8%A1%8C%E4%BA%8E%E5%B9%B3%E9%9D%A2AEB1.2%2C%E5%9C%A8%E6%A3%B1CC1%E4%B8%8A%E6%98%AF%E5%90%A6%E5%AD%98%E5%9C%A8%E7%82%B9E%2C%E4%BD%BF%E5%BE%97%E4%BA%8C%E9%9D%A2%E8%A7%92A%E2%80%94EB1)
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