题文
已知|
|=2,|

|=1,

与

之间夹角为

,那么|

-4

|的值是( )A.2B.2

C.6D.12 题型:未知 难度:其他题型
答案
B解析
该题暂无解析
考点
据考高分专家说,试题“已知||=2.....”主要考查你对 [向量模的计算 ]考点的理解。
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