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[几何] 一道向量小题

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敬畏数学 posted 2016-4-18 09:53 |Read mode
p,a,b均为向量,且满足a*b=-1/2,p*a=p*b=1/2,则|a|——————;

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游客 posted 2016-4-18 11:04
未命名.PNG

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original poster 敬畏数学 posted 2016-4-18 11:59
回复 2# 游客
谢谢!题目是求向量a的模长?

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original poster 敬畏数学 posted 2016-4-18 16:32
Last edited by hbghlyj 2025-5-18 11:59回复 3# 敬畏数学
此题有问题吗?

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nkzxwdy posted 2016-4-18 23:32
按2楼说法,向量a的模可以任意,这样理解对么?

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original poster 敬畏数学 posted 2016-4-19 10:30
回复 5# nkzxwdy
一道有问题的题。

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