∣A−λI∣=∣∣1−λ0201−λ0201−λ∣∣=0(1−λ)3−0−0−4(1−λ)−0−0=0(1−λ)((1−λ)2−4)=0(1−λ)(1−λ−2)(1−λ+2)=0(1−λ)(−1−λ)(3−λ)=0(λ2−1)(λ−3)=0λ1=1,λ2=−1,λ3=3
λ1=1,a1=(x,y,z)=0(A−λ1I)a1=0⎝⎛002000200⎠⎞⋅⎝⎛xyz⎠⎞=⎝⎛000⎠⎞2z=0,2x=0x=z=0,y∈Ra1=(0,1,0)
λ2=−1,a2=(x,y,z)=0(A−λ2I)a2=0⎝⎛202020202⎠⎞⋅⎝⎛xyz⎠⎞=⎝⎛000⎠⎞2x+2z=0,2y=0x=−z,y=0a2=(1,0,−1)
λ3=3,a3=(x,y,z)=0(A−λ3I)a3=0⎝⎛−2020−2020−2⎠⎞⋅⎝⎛xyz⎠⎞=⎝⎛000⎠⎞−2x+2z=0,−2y=0,2x−2z=0x=z=1,y=0a3=(1,0,1)
a1=(0,1,0),∣a1∣=1,a2=(1,0,−1),∣a2∣=2,a3=(1,0,1),∣a3∣=2P=⎝⎛021211000−2121⎠⎞B=P−1APB=⎝⎛1000−10003⎠⎞
A2=⎝⎛102010201⎠⎞⋅⎝⎛102010201⎠⎞=⎝⎛504010405⎠⎞A3=A2⋅A=⎝⎛504010405⎠⎞⋅⎝⎛102010201⎠⎞==⎝⎛1301401014013⎠⎞
A4=A3⋅A=⎝⎛1301401014013⎠⎞⋅⎝⎛102010201⎠⎞==⎝⎛4104001040041⎠⎞
An=⎝⎛a0b010b0a⎠⎞
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