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解方程组

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longzaifei Posted 2014-10-6 10:01 |Read mode

Last edited by longzaifei 2014-10-6 10:07Solve the following system: $2\sqrt{2x+6}=y^2-6, 2\sqrt{2y+6}=z^2-6,2\sqrt{2z+6}=x^2-6$.

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其妙 Posted 2014-10-6 11:10

数据不舒服，用均值不等式？

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wzxsjz Posted 2014-10-6 14:18

函数反函数

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wzxsjz Posted 2014-10-22 18:57

能证明$x \geqslant0 $吗？

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kuing Posted 2014-10-22 21:23

能证明$x \geqslant0 $吗？
wzxsjz 发表于 2014-10-22 18:57

不能，事实上有负的解 $x=y=z=-1-\sqrt3$

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