题目内容

在边长为的正三角形ABC中,设,则等于( )

A.0 B.1 C.3 D.-3

D

解析试题分析:∵三角形ABC为边长为的正三角形,∴,故选D
考点:本题考查了数量积的运用
点评:熟练掌握向量的夹角及数量积的定义是解决此类问题的关键,属基础题

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