若非零向量a,b满足|a|=|b|,(2a+b)•b=0,则a与b夹角

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若非零向量a,b满足|a|=|b|,(2a+b)•b=0,则a与b夹角
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若非零向量a,b满足|a|=|b|,(2a+b)•b=0,则a与b夹角
若非零向量a,b满足|a|=|b|,(2a+b)•b=0,则a与b夹角

若非零向量a,b满足|a|=|b|,(2a+b)•b=0,则a与b夹角

(2a+b)*b=0 则 2ab+b^2=0
2abcosβ+b^2=0
2b^2cosβ+b^2=0
cosβ=-1/2

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