题文
正
的边长为2,则

= . 题型:未知 难度:其他题型
答案

解析
由题意得

夹角为

,则

.
考点
据考高分专家说,试题“正的边长为2,则=......”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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