如图,正方体ABCD-A'B'C'D'中,E在AB1上,F在BD上,且B1E=BF.求证:EF∥平面BB'C'C根据图中已做好的辅助线解题,
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![如图,正方体ABCD-A'B'C'D'中,E在AB1上,F在BD上,且B1E=BF.求证:EF∥平面BB'C'C根据图中已做好的辅助线解题,](/uploads/image/z/5552037-45-7.jpg?t=%E5%A6%82%E5%9B%BE%2C%E6%AD%A3%E6%96%B9%E4%BD%93ABCD-A%27B%27C%27D%27%E4%B8%AD%2CE%E5%9C%A8AB1%E4%B8%8A%2CF%E5%9C%A8BD%E4%B8%8A%2C%E4%B8%94B1E%3DBF.%E6%B1%82%E8%AF%81%EF%BC%9AEF%E2%88%A5%E5%B9%B3%E9%9D%A2BB%27C%27C%E6%A0%B9%E6%8D%AE%E5%9B%BE%E4%B8%AD%E5%B7%B2%E5%81%9A%E5%A5%BD%E7%9A%84%E8%BE%85%E5%8A%A9%E7%BA%BF%E8%A7%A3%E9%A2%98%EF%BC%8C)
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