A. $a = 0, b = -1$
B. $a = 0, b = 1$
C. $a = 1, b = 0$
D. $a = -1, b = 0$
向量 vec(a)=(1,-3,1) 在向量 vec(b)=(2,1,1) 上的投影为()A. $\frac{1}{\sqrt{6}}$B. $\frac{\s
若向量组(alpha )_(1),(alpha )_(2),(alpha )_(3)线性无关，则向量组(alpha )_(1),(alpha )_(2),(al
设向量组(alpha )_(1),(alpha )_(2),(alpha )_(3) 线性无关， (alpha )_(1),(alpha )_(2),(alph
6.设α1,α2,α3线性无关, (beta )_(1)=a(alpha )_(1)+b(alpha )_(2) (beta )_(2)=a(alpha )_(
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 =
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已知平面过点（2，-1，3）且平行于向量vec(a)=(1,2,-1)和向量vec(b)=(3,-1,2)，则该平面方程为（）A. 3x-5y-7z+10=0B
5.求向量组vec(a)_(1)=(1,-1,2,4)^T,vec(a)_(2)=(0,3,1,2)^T,vec(a)_(3)=(3,0,7,14)^T,vec
设矩阵 =((alpha )_(1),(alpha )_(2),(alpha )_(3),(beta )_(1))，=((alpha )_(1),(alpha
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