3.设向量组alpha_(1)=(lambda+3,lambda,3lambda+3,)^T,alpha_(2)=(1,1-lambda,lambda,)^T, alpha_(3)=(2,1,lambda+3,)^T,问lambda取何值时，向量组线性相关.

设向量组 alpha_(1)=(lambda,1,1), alpha_(2)=(1,lambda,1), alpha_(3)=(1,1,lambda) 线性相关

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=(6,lambda+1,4)^T, alpha_2=(lambda,2,2)^T, alpha_3=(lambda,1,0)^T 线性

8.求向量组 alpha_(1)=(1,-1,5,-1)^T, alpha_(2)=(1,1,-2,3)^T, alpha_(3)=(3,-1,8,1)^T,

3.判断题设向量beta可由向量组alpha_(1),alpha_(2),alpha_(3),alpha_(4)线性表示，但不能由alpha_(1),alpha

13.设2阶实对称矩阵A的特征值为lambda_(1),lambda_(2),且lambda_(1)neqlambda_(2),alpha_(1),alpha_

已知向量组 alpha_(1)=(t,2,1)^T,alpha_(2)=(2,t,0)^T,alpha_(3)=(1,-1,1)^T线性相关，则t的值为（）A.

已知向量组alpha_(1),alpha_(2),alpha_(3)线性无关，证明：alpha_(1)+2alpha_(2),2alpha_(1)+3alpha

13.试用初等变换法，(1)求向量组alpha_(1)=(1,4,1,0)^T,alpha_(2)=(2,1,-1,-3)^T,alpha_(3)=(1,0,-

3.设向量 _(1)=((1+lambda ,1,1))^T, _(2)=((1,1+lambda ,1))^T _(3)=((1,1,1+lambda ))^