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[几何] 一个向量题

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转化与化归 posted 2014-6-1 07:37 |Read mode
一个向量题.jpg

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其妙 posted 2014-6-1 15:27
回复 1# 转化与化归
这里有:blog.sina.com.cn/s/blog_d7f6c5a90101rmg4.html
建议楼主以后写一下题目的大致来源出处
original poster 转化与化归 posted 2014-6-1 18:38
回复 2# 其妙

上面是建系的方法,我问的是不建系,直接使用角的话,怎么弄

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其妙 posted 2014-6-1 18:55
回复 3# 转化与化归
我也没仔细看,只看题目较像,一晃眼而已,

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