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original poster: 福州小江

[函数] 一道怪咖向量最值存在问题

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敬畏数学 posted 2017-10-24 14:13
回复 13# hongxian
这个代数做法

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游客 posted 2017-10-24 14:47
回复 20# 敬畏数学


    是的,点在圆上,不是线性区域。

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