在四棱锥P-ABCD中,PA=PB,底面ABCD是菱形,且∠ABC=60°,E在棱PD上,满足PE=2DE,M是AB的中点(1)求证:平面PAB⊥平面PMC(2)求证:直线PB//平面EMC
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![在四棱锥P-ABCD中,PA=PB,底面ABCD是菱形,且∠ABC=60°,E在棱PD上,满足PE=2DE,M是AB的中点(1)求证:平面PAB⊥平面PMC(2)求证:直线PB//平面EMC](/uploads/image/z/2779047-63-7.jpg?t=%E5%9C%A8%E5%9B%9B%E6%A3%B1%E9%94%A5P-ABCD%E4%B8%AD%2CPA%3DPB%2C%E5%BA%95%E9%9D%A2ABCD%E6%98%AF%E8%8F%B1%E5%BD%A2%2C%E4%B8%94%E2%88%A0ABC%3D60%C2%B0%2CE%E5%9C%A8%E6%A3%B1PD%E4%B8%8A%2C%E6%BB%A1%E8%B6%B3PE%3D2DE%2CM%E6%98%AFAB%E7%9A%84%E4%B8%AD%E7%82%B9%281%29%E6%B1%82%E8%AF%81%EF%BC%9A%E5%B9%B3%E9%9D%A2PAB%E2%8A%A5%E5%B9%B3%E9%9D%A2PMC%282%29%E6%B1%82%E8%AF%81%EF%BC%9A%E7%9B%B4%E7%BA%BFPB%2F%2F%E5%B9%B3%E9%9D%A2EMC)
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