一题立体几何,设A是三角形BCD所在平面外一点,M,N分别是三角形ABC和三角形ACD的重心.求证:MN//平面BCD具体点的说明。∠MAN = ∠EAF,和∠MAN = ∠EAF怎么证明的,就是这个想不同才问的,你说的那些
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![一题立体几何,设A是三角形BCD所在平面外一点,M,N分别是三角形ABC和三角形ACD的重心.求证:MN//平面BCD具体点的说明。∠MAN = ∠EAF,和∠MAN = ∠EAF怎么证明的,就是这个想不同才问的,你说的那些](/uploads/image/z/15054876-36-6.jpg?t=%E4%B8%80%E9%A2%98%E7%AB%8B%E4%BD%93%E5%87%A0%E4%BD%95%2C%E8%AE%BEA%E6%98%AF%E4%B8%89%E8%A7%92%E5%BD%A2BCD%E6%89%80%E5%9C%A8%E5%B9%B3%E9%9D%A2%E5%A4%96%E4%B8%80%E7%82%B9%2CM%2CN%E5%88%86%E5%88%AB%E6%98%AF%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E5%92%8C%E4%B8%89%E8%A7%92%E5%BD%A2ACD%E7%9A%84%E9%87%8D%E5%BF%83.%E6%B1%82%E8%AF%81%3AMN%2F%2F%E5%B9%B3%E9%9D%A2BCD%E5%85%B7%E4%BD%93%E7%82%B9%E7%9A%84%E8%AF%B4%E6%98%8E%E3%80%82%E2%88%A0MAN+%3D+%E2%88%A0EAF%2C%E5%92%8C%E2%88%A0MAN+%3D+%E2%88%A0EAF%E6%80%8E%E4%B9%88%E8%AF%81%E6%98%8E%E7%9A%84%EF%BC%8C%E5%B0%B1%E6%98%AF%E8%BF%99%E4%B8%AA%E6%83%B3%E4%B8%8D%E5%90%8C%E6%89%8D%E9%97%AE%E7%9A%84%EF%BC%8C%E4%BD%A0%E8%AF%B4%E7%9A%84%E9%82%A3%E4%BA%9B)
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