6.设α1,α2,α3线性无关, (beta )_(1)=a(alpha )_(1)+b(alpha )_(2) (beta )_(2)=a(alpha )_(
设 alpha (alpha )_(1),(alpha )_(2),(alpha )_(3),(beta )_(1),(beta )_(2) 均为四维列向量矩阵
设三阶矩阵 =(alpha ,gamma 1,(y)_(2)), =(beta ,gamma 1,(gamma )_(2))其中 =(alpha ,gamma
设矩阵 =((alpha )_(1),(alpha )_(2),(alpha )_(3),(beta )_(1)),=((alpha )_(1),(alpha
设 alpha, beta 都是 n 维的单位列向量,则 alpha - beta 与 alpha + beta 的内积为()A. 1B. 0C. -1D. 2
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_(
beta_1 = alpha_1, beta_2 = alpha_1 + alpha_2, beta_3 = alpha_1 + alpha_2 + alpha
4.设向量组beta_(1)=alpha_(1)+2alpha_(2)-alpha_(3),beta_(2)=alpha_(1)+2alpha_(2)+2alp
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.若向量组α1,α2,α3线性无关, (beta )_(1)=(alpha )_(1)-(alpha )_(2), (beta )_(2)=(alpha )_