B．eta submitted a statement to Alpha as at the same date showing a balance due of $5,200.
Which of the following could account fully for the difference?
A． Alpha has sent a cheque to Beta for $500 which has not yet been received by Beta.
B． The credit side of Beta’s account in Alpha’s records has been undercast by $500.
C． An invoice for $250 from Beta has been treated in Alpha’s records as if it had been a credit note.
D． Beta has issued a credit note for $500 to Alpha which Alpha has not yet received.
1 设 -|||-A、 α,β.-|||-B、 α,β,y:-|||-C、 alpha +beta ;-|||-D、 alpha -beta ;
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
beta_1 = alpha_1, beta_2 = alpha_1 + alpha_2, beta_3 = alpha_1 + alpha_2 + alpha
设 alpha (alpha )_(1),(alpha )_(2),(alpha )_(3),(beta )_(1),(beta )_(2) 均为四维列向量矩阵
已知: alpha_1, alpha_2, alpha_3 线性无关，beta_1 = 2alpha_2 - alpha_3，beta_2 = -alpha_1
4.(判断题) 向量组满足 beta_(1)=alpha_(1), beta_(2)=alpha_(1)+alpha_(2), beta_(3)=alpha_(
[主观题]My mother________（常常）buys food from the store．
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_(
4.设向量组beta_(1)=alpha_(1)+2alpha_(2)-alpha_(3),beta_(2)=alpha_(1)+2alpha_(2)+2alp
6.设α1,α2,α3线性无关, (beta )_(1)=a(alpha )_(1)+b(alpha )_(2) (beta )_(2)=a(alpha )_(