在三棱锥S-ABC中,△ABC是边长为4的正三角形,平面SAC⊥平面ABC,SA=SC=2根号3,M,N分别是AB,SB的中点1.求二面角N-CM-B的大小2.求点B到平面CMN的距离不要用向量
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![在三棱锥S-ABC中,△ABC是边长为4的正三角形,平面SAC⊥平面ABC,SA=SC=2根号3,M,N分别是AB,SB的中点1.求二面角N-CM-B的大小2.求点B到平面CMN的距离不要用向量](/uploads/image/z/1838032-16-2.jpg?t=%E5%9C%A8%E4%B8%89%E6%A3%B1%E9%94%A5S-ABC%E4%B8%AD%2C%E2%96%B3ABC%E6%98%AF%E8%BE%B9%E9%95%BF%E4%B8%BA4%E7%9A%84%E6%AD%A3%E4%B8%89%E8%A7%92%E5%BD%A2%2C%E5%B9%B3%E9%9D%A2SAC%E2%8A%A5%E5%B9%B3%E9%9D%A2ABC%2CSA%3DSC%3D2%E6%A0%B9%E5%8F%B73%2CM%2CN%E5%88%86%E5%88%AB%E6%98%AFAB%2CSB%E7%9A%84%E4%B8%AD%E7%82%B91.%E6%B1%82%E4%BA%8C%E9%9D%A2%E8%A7%92N-CM-B%E7%9A%84%E5%A4%A7%E5%B0%8F2.%E6%B1%82%E7%82%B9B%E5%88%B0%E5%B9%B3%E9%9D%A2CMN%E7%9A%84%E8%B7%9D%E7%A6%BB%E4%B8%8D%E8%A6%81%E7%94%A8%E5%90%91%E9%87%8F)
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