题文
设向量
,

,若

,则实数

. 题型:未知 难度:其他题型
答案

解析
因为

,

,
因为

,所以

,解得

.
考点
据考高分专家说,试题“设向量,,若,则实数......”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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