题文
已知向量
,且

,则实数

=( )A.

B.0C.3D.

题型:未知 难度:其他题型
答案
C解析
因为

所以

又因为

,所以,

,所以,

,解得:

故选C.
考点
据考高分专家说,试题“已知向量,且,则实数=()A.B.0C......”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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