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[数论] 征集优秀解答

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957683999 posted 2014-10-28 17:16 |Read mode
称空间坐标为非负整数的点为优点,求证:经过优点的个数恰为完全平方数个的平面有无数多个!(我的做法是构造,希望看到其它方法)

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战巡 posted 2014-10-29 03:20
回复 1# 957683999

这不是显然的么?别说过优点恰为平方数的有无数个,就算我定死这个完全平方数为1,这样的平面都已经有无数个了

平面$k_1\sqrt{2}x+k_2\sqrt{3}y+k_3\sqrt{5}z=0$,只过$(0,0,0)$这一个优点,$k_1,k_2,k_3$非零整数任取

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original poster 957683999 posted 2014-10-29 11:25
精彩,我的表述不太准确,应该为:称空间坐标为非负整数的点为优点,求证:对任意的正整数n经过优点的个数恰为n的平方个的平面一定存在!

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kuing posted 2014-10-29 18:43
凡求优秀解答的,将你认为不优秀的解答贴出来。

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