题文
已知向量
=(2,-1),

·

=10,|

-

|=

,则|

|=( )A.20B.40C.2

D.2

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