题文
若
,

,且

,则

与

的夹角是 . 题型:未知 难度:其他题型
答案

解析
∵

,∴

,即

,
∴

,即

与

的夹角为

.
考点
据考高分专家说,试题“若, ,且,则与的夹角是......”主要考查你对 [向量数量积的含义及几何意义 ]考点的理解。
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