如图,四棱锥P-ABCD的底面是正方形,PD⊥底面ABCD,点E在棱PB上,(1)求证平面AEC如图,四棱锥P-ABCD的底面是正方形,PD⊥底面ABCD,点E在棱PB上,(1)求证平面AEC⊥平面PDB(2)当PD=√2,AB=2,且VA-PED=1/3时,
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![如图,四棱锥P-ABCD的底面是正方形,PD⊥底面ABCD,点E在棱PB上,(1)求证平面AEC如图,四棱锥P-ABCD的底面是正方形,PD⊥底面ABCD,点E在棱PB上,(1)求证平面AEC⊥平面PDB(2)当PD=√2,AB=2,且VA-PED=1/3时,](/uploads/image/z/7849478-38-8.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9B%9B%E6%A3%B1%E9%94%A5P-ABCD%E7%9A%84%E5%BA%95%E9%9D%A2%E6%98%AF%E6%AD%A3%E6%96%B9%E5%BD%A2%2CPD%E2%8A%A5%E5%BA%95%E9%9D%A2ABCD%2C%E7%82%B9E%E5%9C%A8%E6%A3%B1PB%E4%B8%8A%2C%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81%E5%B9%B3%E9%9D%A2AEC%E5%A6%82%E5%9B%BE%2C%E5%9B%9B%E6%A3%B1%E9%94%A5P-ABCD%E7%9A%84%E5%BA%95%E9%9D%A2%E6%98%AF%E6%AD%A3%E6%96%B9%E5%BD%A2%2CPD%E2%8A%A5%E5%BA%95%E9%9D%A2ABCD%2C%E7%82%B9E%E5%9C%A8%E6%A3%B1PB%E4%B8%8A%2C%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81%E5%B9%B3%E9%9D%A2AEC%E2%8A%A5%E5%B9%B3%E9%9D%A2PDB%EF%BC%882%EF%BC%89%E5%BD%93PD%3D%E2%88%9A2%2CAB%3D2%2C%E4%B8%94VA-PED%3D1%2F3%E6%97%B6%2C)
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