【简答题】在R 3 中定义线性变换σ为 σ(x 1 ,x 2 ,x 3 )=(2x 1 -x 2 ,x 2 +x 3 ,x 1 ) (1)求σ在基ξ 1 =(1,0,0),ξ 2 =(0,1,0),ξ 3 =(0,0,1)下的矩阵; (2)设α=(1,0,-2),求σ(α)在基α 1 =(2,0,1),α 2 =(0,-1,1),α 3 =(-1,0,2)下的坐标. (3)σ是否可逆,若可逆,求σ -1 .
【简答题】在线性空间M2(R)中定义变换. (1)试证σ是线性变换. (2)写出M2(R)的一组基,并求σ在这组基下的矩阵.在线性空间M 2 (R)中定义变换. 对于任意(x1,x2,x3)∈R^3,σ((x1,x2,x3))=(2x1+x2+x3,x1+2x2+x3,x1+x2+2x3) (1)试证σ是线性变换. (2)写出M 2 (R)的一组基,并求σ在这组基下的矩阵.
【单选题】人员招聘的前提有两个:一是人力资源规划,二是( )
【简答题】The restaurant has been ______ sale by its owner.
【简答题】The restaurant has been ______ sale by its owner.