求助这个对称行列式(特征值)求法?
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求助这个对称行列式(特征值)求法?
用三阶行列式的计算公式,= -(2-x)(1-x)x + 4x - 4(2-x)
= -(2-3x+x*x)x +4x -8+4x = -x*x*x +3x*x +6x - 8 = -x*x*x +x*x + 2*x*x +6x-8
= -x*x(x-1) + 2*(x-1)*(x-4) = -(x-1)(x*x -2x +8) = -(x-1)*(x-4)*(x+2)
= -(2-3x+x*x)x +4x -8+4x = -x*x*x +3x*x +6x - 8 = -x*x*x +x*x + 2*x*x +6x-8
= -x*x(x-1) + 2*(x-1)*(x-4) = -(x-1)(x*x -2x +8) = -(x-1)*(x-4)*(x+2)