题文
已知|
|=|

|=|

-2

|=1,则|

+2

|=( )A.9B.3C.1D.2 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||=|.....”主要考查你对 [向量模的计算 ]考点的理解。
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