设 alpha, beta 都是 n 维的单位列向量，则 alpha - beta 与 alpha + beta 的内积为()

A. 1

B. 0

C. -1

D. 2

参考答案与解析：

相关试题

设 P 为正交矩阵，向量 alpha, beta 的内积为 (alpha, beta)= 2，则 (Palpha, Pbeta)= (

设 P 为正交矩阵，向量 alpha, beta 的内积为 (alpha, beta)= 2，则 (Palpha, Pbeta)= (A. $\frac{1}{

  • 查看答案

    • 设 alpha (alpha )_(1),(alpha )_(2),(alpha )_(3),(beta )_(1),(beta )_(2) 均为四维列向量矩阵，alpha (alpha )_(1),

    设 alpha (alpha )_(1),(alpha )_(2),(alpha )_(3),(beta )_(1),(beta )_(2) 均为四维列向量矩阵

  • 查看答案

    • 设α、β、γ都是非零向量，α&ti

    [单选题]设α、β、γ都是非零向量，α×β=α×γ，则（）。A . AB . BC . CD . D

  • 查看答案

    • 7.设alpha_(1),alpha_(2),alpha_(3),beta_(1),beta_(2)均为4维列向量，矩阵A=(alpha_(1),alpha_(2),alpha_(3),beta_(1

    7.设alpha_(1),alpha_(2),alpha_(3),beta_(1),beta_(2)均为4维列向量，矩阵A=(alpha_(1),alpha_(

  • 查看答案

    • 1 设 -|||-A、 α,β.-|||-B、 α,β,y:-|||-C、 alpha +beta ;-|||-D、 alpha -beta ;

    1 设 -|||-A、 α,β.-|||-B、 α,β,y:-|||-C、 alpha +beta ;-|||-D、 alpha -beta ;

  • 查看答案

    • 4.设向量组beta_(1)=alpha_(1)+2alpha_(2)-alpha_(3),beta_(2)=alpha_(1)+2alpha_(2)+2alpha_(3),beta_(3)=alph

    4.设向量组beta_(1)=alpha_(1)+2alpha_(2)-alpha_(3),beta_(2)=alpha_(1)+2alpha_(2)+2alp

  • 查看答案

    • 已知 alpha_1, alpha_2, alpha_3, beta, gamma 均为 4 维列向量，又 A = (alpha_1, alpha_2, alpha_3, beta)，B = (alp

    已知 alpha_1, alpha_2, alpha_3, beta, gamma 均为 4 维列向量，又 A = (alpha_1, alpha_2, alp

  • 查看答案

    • 已知alpha_(1),alpha_(2),beta,gamma均为3维列向量，又A=(alpha_(1),alpha_(2),beta)，B=(alpha_(1),alpha_(2),gamma)，

    已知alpha_(1),alpha_(2),beta,gamma均为3维列向量，又A=(alpha_(1),alpha_(2),beta)，B=(alpha_(

  • 查看答案

    • 设向量组 alpha_1, alpha_2, alpha_3线性无关，判断向量组 beta_1 = alpha_1 + alpha_2、beta_2 = alpha_2 + alpha_3、b

    设向量组 alpha_1, alpha_2, alpha_3线性无关，判断向量组 beta_1 = alpha_1 + alpha_2、beta_2 =

  • 查看答案

    • 9.设向量组α1,α 2,α3与向量组β1 β2,β3有如下关系:-|||-(beta )_(1)=(alpha )_(2)+(alpha )_(3) (beta )_(2)=(alpha )_(1)

    9.设向量组α1,α 2,α3与向量组β1 β2,β3有如下关系:-|||-(beta )_(1)=(alpha )_(2)+(alpha )_(3) (bet

  • 查看答案