题文
若平面向量
,
,
两两所成的角相等,|
|=|
|=1,|
|=3,则|
+
+
|=( )
答案
C解析
该题暂无解析
考点
据考高分专家说,试题“.....”主要考查你对 [向量数量积的运算 ]考点的理解。
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