题文
已知
,

,

=12则向量

在向量

上的夹角余弦为 . 题型:未知 难度:其他题型
答案

解析

.
考点
据考高分专家说,试题“已知,,=12则向量在向量上的夹角余弦为.....”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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