已知P是三角形ABC所在平面外一点,E为PA中点,F为PC中点,······求证EF是BE,PC公垂线,若`````
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![已知P是三角形ABC所在平面外一点,E为PA中点,F为PC中点,······求证EF是BE,PC公垂线,若`````](/uploads/image/z/9937704-48-4.jpg?t=%E5%B7%B2%E7%9F%A5P%E6%98%AF%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E6%89%80%E5%9C%A8%E5%B9%B3%E9%9D%A2%E5%A4%96%E4%B8%80%E7%82%B9%2CE%E4%B8%BAPA%E4%B8%AD%E7%82%B9%2CF%E4%B8%BAPC%E4%B8%AD%E7%82%B9%2C%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%E6%B1%82%E8%AF%81EF%E6%98%AFBE%2CPC%E5%85%AC%E5%9E%82%E7%BA%BF%2C%E8%8B%A5%60%60%60%60%60)
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