齐次方程组{2x1-x2+3x3=0x1-3x2+4x3=0-x1+2x2-λx3=0有非0解,则λ=____

齐次方程组
{2x1-x2+3x3=0
x1-3x2+4x3=0
-x1+2x2-λx3=0
有非0解,则λ=____
【正确答案】:3