如图,四棱锥P-ABCD中,底面ABCD为菱形,PA⊥底面ABCD,AC=2倍根号2 ,PA=2,E是PC上的一点,PE=2EC. (Ⅰ)证明:PC⊥平面BED; (Ⅱ)设二面角A-PB-C为90°,求PD与平面PBC所成角的大小.(;;;;;°∇°) 不
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![如图,四棱锥P-ABCD中,底面ABCD为菱形,PA⊥底面ABCD,AC=2倍根号2 ,PA=2,E是PC上的一点,PE=2EC. (Ⅰ)证明:PC⊥平面BED; (Ⅱ)设二面角A-PB-C为90°,求PD与平面PBC所成角的大小.(;;;;;°∇°) 不](/uploads/image/z/7140739-67-9.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9B%9B%E6%A3%B1%E9%94%A5P-ABCD%E4%B8%AD%2C%E5%BA%95%E9%9D%A2ABCD%E4%B8%BA%E8%8F%B1%E5%BD%A2%2CPA%E2%8A%A5%E5%BA%95%E9%9D%A2ABCD%2CAC%3D2%E5%80%8D%E6%A0%B9%E5%8F%B72+%2CPA%3D2%2CE%E6%98%AFPC%E4%B8%8A%E7%9A%84%E4%B8%80%E7%82%B9%2CPE%3D2EC%EF%BC%8E+%EF%BC%88%E2%85%A0%EF%BC%89%E8%AF%81%E6%98%8E%EF%BC%9APC%E2%8A%A5%E5%B9%B3%E9%9D%A2BED%EF%BC%9B+%EF%BC%88%E2%85%A1%EF%BC%89%E8%AE%BE%E4%BA%8C%E9%9D%A2%E8%A7%92A-PB-C%E4%B8%BA90%C2%B0%2C%E6%B1%82PD%E4%B8%8E%E5%B9%B3%E9%9D%A2PBC%E6%89%80%E6%88%90%E8%A7%92%E7%9A%84%E5%A4%A7%E5%B0%8F%EF%BC%8E%28%3B%3B%3B%3B%3B%C2%B0%26%238711%3B%C2%B0%29%26%23160%3B%E4%B8%8D)
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