悠闲数学娱乐论坛(第3版)»论坛 › 数学区 › 初等数学讨论 › 2015泰州高三期末的一道向量试题

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[几何] 2015泰州高三期末的一道向量试题

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aishuxue Post time 2015-2-7 10:18 |Read mode

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luren8asdf Post time 2015-2-7 21:05

D、C、F为对应边中点
P为三等分点有DP=2
夹角余弦值1/3

可算得最小值（4*根2）/3

但当垂足不在线段AD上的时候答案是不正确的

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其妙 Post time 2015-2-10 21:55

see also：blog.sina.com.cn/s/blog_c4fc118d0102vnkm.html

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