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如图,已知四棱锥P-ABCD的底面为等腰梯形,AB∥CD,AC⊥BD,垂足为H,PH是四棱锥的高.
(Ⅰ)证明:平面PAC⊥平面PBD;
(Ⅱ)若
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,∠APB=∠ADB=60°,求四棱锥P-ABCD的体积.
考点分析:
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