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回复 lemondian 比较杂,用电脑算了下 a=0,c=b^2,取最大值 5+2Sqrt(5) wanhuihua 发表于 2018-2-24 14:52
这个结果不正确,当 a = -0.23, b = -1.69461, c = 2.6417 时满足条件,此时 a^2+b^2+c^2 约为 9.9,比 5+ ... kuing 发表于 2018-2-24 19:45
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