设四面体的六条棱的长分别为1,1,1,1,根号2和a 且长为a的棱与长为根号2的棱异面则a的取值范围设AB=a,CD=√2BC=BD=AC=AD=1,则∠ACD=∠BCD=45°,要构造一个四面体,则△ACD与共面BCD不能重合,
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![设四面体的六条棱的长分别为1,1,1,1,根号2和a 且长为a的棱与长为根号2的棱异面则a的取值范围设AB=a,CD=√2BC=BD=AC=AD=1,则∠ACD=∠BCD=45°,要构造一个四面体,则△ACD与共面BCD不能重合,](/uploads/image/z/9653543-71-3.jpg?t=%E8%AE%BE%E5%9B%9B%E9%9D%A2%E4%BD%93%E7%9A%84%E5%85%AD%E6%9D%A1%E6%A3%B1%E7%9A%84%E9%95%BF%E5%88%86%E5%88%AB%E4%B8%BA1%2C1%2C1%2C1%2C%E6%A0%B9%E5%8F%B72%E5%92%8Ca+%E4%B8%94%E9%95%BF%E4%B8%BAa%E7%9A%84%E6%A3%B1%E4%B8%8E%E9%95%BF%E4%B8%BA%E6%A0%B9%E5%8F%B72%E7%9A%84%E6%A3%B1%E5%BC%82%E9%9D%A2%E5%88%99a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E8%AE%BEAB%EF%BC%9Da%2CCD%EF%BC%9D%E2%88%9A2BC%EF%BC%9DBD%EF%BC%9DAC%EF%BC%9DAD%EF%BC%9D1%2C%E5%88%99%E2%88%A0ACD%EF%BC%9D%E2%88%A0BCD%EF%BC%9D45%C2%B0%2C%E8%A6%81%E6%9E%84%E9%80%A0%E4%B8%80%E4%B8%AA%E5%9B%9B%E9%9D%A2%E4%BD%93%2C%E5%88%99%E2%96%B3ACD%E4%B8%8E%E5%85%B1%E9%9D%A2BCD%E4%B8%8D%E8%83%BD%E9%87%8D%E5%90%88%2C)
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