如图所示,三棱锥a-bcd中m,n,g分别是△abc,△bcd,△abd的重心求证:平面MNG//平面ACD求三角形MNG与三角形ACD面积之比
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![如图所示,三棱锥a-bcd中m,n,g分别是△abc,△bcd,△abd的重心求证:平面MNG//平面ACD求三角形MNG与三角形ACD面积之比](/uploads/image/z/13854741-69-1.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E4%B8%89%E6%A3%B1%E9%94%A5a-bcd%E4%B8%ADm%2Cn%2Cg%E5%88%86%E5%88%AB%E6%98%AF%E2%96%B3abc%2C%E2%96%B3bcd%2C%E2%96%B3abd%E7%9A%84%E9%87%8D%E5%BF%83%E6%B1%82%E8%AF%81%EF%BC%9A%E5%B9%B3%E9%9D%A2MNG%2F%2F%E5%B9%B3%E9%9D%A2ACD%E6%B1%82%E4%B8%89%E8%A7%92%E5%BD%A2MNG%E4%B8%8E%E4%B8%89%E8%A7%92%E5%BD%A2ACD%E9%9D%A2%E7%A7%AF%E4%B9%8B%E6%AF%94)
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