已知一四棱锥P-ABCD的三视图如图,E是侧棱PC上的动点.若点E为PC的中点,求二面角D-AE-B的大小若点E为PC的中点,求二面角D-AE-B的大小
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![已知一四棱锥P-ABCD的三视图如图,E是侧棱PC上的动点.若点E为PC的中点,求二面角D-AE-B的大小若点E为PC的中点,求二面角D-AE-B的大小](/uploads/image/z/12687777-9-7.jpg?t=%E5%B7%B2%E7%9F%A5%E4%B8%80%E5%9B%9B%E6%A3%B1%E9%94%A5P-ABCD%E7%9A%84%E4%B8%89%E8%A7%86%E5%9B%BE%E5%A6%82%E5%9B%BE%2CE%E6%98%AF%E4%BE%A7%E6%A3%B1PC%E4%B8%8A%E7%9A%84%E5%8A%A8%E7%82%B9.%E8%8B%A5%E7%82%B9E%E4%B8%BAPC%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E6%B1%82%E4%BA%8C%E9%9D%A2%E8%A7%92D-AE-B%E7%9A%84%E5%A4%A7%E5%B0%8F%E8%8B%A5%E7%82%B9E%E4%B8%BAPC%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E6%B1%82%E4%BA%8C%E9%9D%A2%E8%A7%92D-AE-B%E7%9A%84%E5%A4%A7%E5%B0%8F)
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