试问λ取何值时,齐次线性方程组x+y+z=0,x+λy+z=0,x+y+λ2z=0,有非零性?

问题描述:

试问λ取何值时,齐次线性方程组x+y+z=0,x+λy+z=0,x+y+λ2z=0,有非零性?

系数行列式等于0时有非零解