题文
已知向量
,

满足


=0,|

|=1,|

|=2,则|2

﹣

|=( ) 题型:未知 难度:其他题型
答案

解析
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考点
据考高分专家说,试题“已知向量,满足=0,||=1,||.....”主要考查你对 [向量数量积的运算 ]考点的理解。
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