单选题 20/20 设overrightarrow(alpha_{1)}=(1,-1,2,-1),overrightarrow(alpha_{2)}=(-2,2,3,2),overrightarrow(alpha_{3)},试判断=(1,2,0,-1),overrightarrow(alpha_{4)}=(1,0,0,1)向量组overrightarrow(alpha_{1)},overrightarrow(alpha_{2)},overrightarrow(alpha_{3)},overrightarrow(alpha_{4)}是否为正交向量组.

13.单选题若alpha_(1)=(1-1 2),alpha_(2)=(-2 1 0),alpha_(3)=(-1 0 t)线性相关,则()A. t=-2B.

1.单选题已知向量组alpha_(1),alpha_(2),alpha_(3)线性无关，则A. 向量组$\alpha_{1},\alpha_{1}-\alpha

设overrightarrow(a)=（1，-1，2），overrightarrow(b)=（3，-2，-1），则overrightarrow(a)×overr

已知向量组alpha_(1),alpha_(2),alpha_(3)线性无关，若alpha_(1)+alpha_(2),alpha_(2)+alpha_(3),

设向量组alpha_(1)=(1,-1,2,4),alpha_(2)=(0,3,1,2),alpha_(3)=(3,0,7,14),alpha_(4)=(1,-

【例19】(2025-2)设矩阵A=(alpha_(1),alpha_(2),alpha_(3),alpha_(4)).若alpha_(1),alpha_(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_(

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

已知向量组A: overrightarrow ({alpha )_(1)}=(0,1,2,3)T overrightarrow ({alpha )_(2)}=(

已知alpha_{1),alpha_(2)}是R^2的一组基，求从基alpha_(1)+2alpha_(2),3alpha_(1)+5alpha_(2)到基-a