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|a|、|b|、|b-a|組成三角形,|b|=1固定長,|b|、|b-a|夾角為30度.a向量和b向量的起點重合,當a向量垂直b-a向量時,|a|最小=1/2,|a|最大沒有限制. 所以,|a|的最值範圍是[1/2,+無窮)
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