已知在四棱锥P–ABCD中,底面ABCD是平行四边形,PA⊥平面ABCD,PA=√3,AB=1,AD=2,∠BAD=120°,E,F,G,H分别是BC,PB,PC,AD的中点.(Ⅰ)PH//平面GED; (Ⅱ)过点F做平面α,当平面α与平面EDG所成90°角时,设PA与平面α
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![已知在四棱锥P–ABCD中,底面ABCD是平行四边形,PA⊥平面ABCD,PA=√3,AB=1,AD=2,∠BAD=120°,E,F,G,H分别是BC,PB,PC,AD的中点.(Ⅰ)PH//平面GED; (Ⅱ)过点F做平面α,当平面α与平面EDG所成90°角时,设PA与平面α](/uploads/image/z/4537526-14-6.jpg?t=%E5%B7%B2%E7%9F%A5%E5%9C%A8%E5%9B%9B%E6%A3%B1%E9%94%A5P%E2%80%93ABCD%E4%B8%AD%2C%E5%BA%95%E9%9D%A2ABCD%E6%98%AF%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2%2CPA%E2%8A%A5%E5%B9%B3%E9%9D%A2ABCD%2CPA%3D%E2%88%9A3%2CAB%3D1%2CAD%3D2%2C%E2%88%A0BAD%3D120%C2%B0%2CE%2CF%2CG%2CH%E5%88%86%E5%88%AB%E6%98%AFBC%2CPB%2CPC%2CAD%E7%9A%84%E4%B8%AD%E7%82%B9.%28%E2%85%A0%29PH%2F%2F%E5%B9%B3%E9%9D%A2GED%EF%BC%9B++++%28%E2%85%A1%29%E8%BF%87%E7%82%B9F%E5%81%9A%E5%B9%B3%E9%9D%A2%CE%B1%2C%E5%BD%93%E5%B9%B3%E9%9D%A2%CE%B1%E4%B8%8E%E5%B9%B3%E9%9D%A2EDG%E6%89%80%E6%88%9090%C2%B0%E8%A7%92%E6%97%B6%2C%E8%AE%BEPA%E4%B8%8E%E5%B9%B3%E9%9D%A2%CE%B1)
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