16.设向量的方向余弦分别满足(1) cos alpha =0; (2) cos beta =1; (3) cos alpha =cos beta =0, 问这-|||-些向量与坐标轴或坐标面的关系如何?

1.“sin^2 alpha +sin^2 beta =1”是“sin alpha +cos beta =0”的（）.A. 充分非必要条件B. 必要非充分条件C

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

向量 alpha = ((1)/(2) ), beta = ((3)/(2) ), 向量 gamma 满足 2gamma + alpha = 3beta, 那么

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

设向量0 1 2-|||-(alpha )_(1)= 1 _(2)= 1 ,beta = 1-|||--1 1 3，则0 1 2-|||-(alpha )_(1

设alpha=(3,-1,0,2)^T，beta=(3,1,-1,4)^T，若向量gamma满足2alpha+gamma=3beta，则gamma=().A.

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 =

8.设向量alpha_(1)=(1,0,-2)^T，alpha_(2)=(0,0,1)^T，向量beta是alpha_(1),alpha_(2)的线性组合，则下

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

4.(判断题) 向量组满足 beta_(1)=alpha_(1), beta_(2)=alpha_(1)+alpha_(2), beta_(3)=alpha_(