在四棱锥P-ABCD中,底面ABCD是正方形,侧棱PD⊥底面ABCD,PD=DC,E是PC的中点,做EF⊥PB交PB于点F.求证:⑴PA∥平面EDB ⑵PB⊥平面EFD
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![在四棱锥P-ABCD中,底面ABCD是正方形,侧棱PD⊥底面ABCD,PD=DC,E是PC的中点,做EF⊥PB交PB于点F.求证:⑴PA∥平面EDB ⑵PB⊥平面EFD](/uploads/image/z/1818505-1-5.jpg?t=%E5%9C%A8%E5%9B%9B%E6%A3%B1%E9%94%A5P-ABCD%E4%B8%AD%2C%E5%BA%95%E9%9D%A2ABCD%E6%98%AF%E6%AD%A3%E6%96%B9%E5%BD%A2%2C%E4%BE%A7%E6%A3%B1PD%E2%8A%A5%E5%BA%95%E9%9D%A2ABCD%2CPD%3DDC%2CE%E6%98%AFPC%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E5%81%9AEF%E2%8A%A5PB%E4%BA%A4PB%E4%BA%8E%E7%82%B9F.%E6%B1%82%E8%AF%81%EF%BC%9A%E2%91%B4PA%E2%88%A5%E5%B9%B3%E9%9D%A2EDB+++++++++++%E2%91%B5PB%E2%8A%A5%E5%B9%B3%E9%9D%A2EFD)
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