题文
设
,

,

是任意的非零向量,且相互不共线,下列命题:
(1)(


)

-(


)

=0,
(2)|

|-|

|<|

-

|,
(3)(


)

-(


)

不与c垂直,
(4)(3

+4

)(3

-4

)=9|

|2-16|

|2.
其中正确的命题有( )A.(1)(2)B.(2)(3)C.(3)(4)D.(2)(4) 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“设,,是任意.....”主要考查你对 [向量数量积的运算 ]考点的理解。
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