问两个立体几何问题求证:1.对角线相等的平行六面体是长方体.2.三个平面两两相交,有三条交线.求证:这三条交线交于一点或互相平行.
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![问两个立体几何问题求证:1.对角线相等的平行六面体是长方体.2.三个平面两两相交,有三条交线.求证:这三条交线交于一点或互相平行.](/uploads/image/z/15104418-42-8.jpg?t=%E9%97%AE%E4%B8%A4%E4%B8%AA%E7%AB%8B%E4%BD%93%E5%87%A0%E4%BD%95%E9%97%AE%E9%A2%98%E6%B1%82%E8%AF%81%EF%BC%9A1.%E5%AF%B9%E8%A7%92%E7%BA%BF%E7%9B%B8%E7%AD%89%E7%9A%84%E5%B9%B3%E8%A1%8C%E5%85%AD%E9%9D%A2%E4%BD%93%E6%98%AF%E9%95%BF%E6%96%B9%E4%BD%93.2.%E4%B8%89%E4%B8%AA%E5%B9%B3%E9%9D%A2%E4%B8%A4%E4%B8%A4%E7%9B%B8%E4%BA%A4%2C%E6%9C%89%E4%B8%89%E6%9D%A1%E4%BA%A4%E7%BA%BF.%E6%B1%82%E8%AF%81%EF%BC%9A%E8%BF%99%E4%B8%89%E6%9D%A1%E4%BA%A4%E7%BA%BF%E4%BA%A4%E4%BA%8E%E4%B8%80%E7%82%B9%E6%88%96%E4%BA%92%E7%9B%B8%E5%B9%B3%E8%A1%8C.)
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