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[几何] 平面向量数量积的最小值问题

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敬畏数学 posted 2017-10-24 09:07 |Read mode
Last edited by 敬畏数学 2017-10-24 10:00平面向量a,b,c,|a|=1,|b|=|c|=2,则(c-a)(c-b)的最小值————?

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游客 posted 2017-10-24 09:52
Last edited by 游客 2017-10-24 10:12这个数据是不是只能用三角或坐标?
未命名.PNG

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original poster 敬畏数学 posted 2017-10-24 09:56
回复 2# 游客
任何方法都行啊!谢谢。有高手算出答案-1/2.and you?

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original poster 敬畏数学 posted 2017-10-24 10:23
回复 2# 游客

请您再思考能否几何解释下?TIA。a,b,c三向量彼此之间没有约束。

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游客 posted 2017-10-24 13:49
未命名.PNG

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kuing posted 2017-10-24 14:05
见:forum.php?mod=viewthread&tid=4351(楼主也回过这帖,忘了?)

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