如图,已知三棱锥P-ABC中,PA垂直于平面ABC,AB垂直于AC,AC=1/2AB,N为AB上一点,AB=4AN,M,S分别为PB和BC的中点求证CM垂直于SN
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![如图,已知三棱锥P-ABC中,PA垂直于平面ABC,AB垂直于AC,AC=1/2AB,N为AB上一点,AB=4AN,M,S分别为PB和BC的中点求证CM垂直于SN](/uploads/image/z/13961291-59-1.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%B7%B2%E7%9F%A5%E4%B8%89%E6%A3%B1%E9%94%A5P-ABC%E4%B8%AD%2CPA%E5%9E%82%E7%9B%B4%E4%BA%8E%E5%B9%B3%E9%9D%A2ABC%2CAB%E5%9E%82%E7%9B%B4%E4%BA%8EAC%2CAC%3D1%2F2AB%2CN%E4%B8%BAAB%E4%B8%8A%E4%B8%80%E7%82%B9%2CAB%3D4AN%2CM%2CS%E5%88%86%E5%88%AB%E4%B8%BAPB%E5%92%8CBC%E7%9A%84%E4%B8%AD%E7%82%B9%E6%B1%82%E8%AF%81CM%E5%9E%82%E7%9B%B4%E4%BA%8ESN)
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