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å½ç¶ï¼æ¢ç¶ç¥éç»æï¼ä¸å¦¨å¤ãè¯ãä¸ä¸ã
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è¡åå¼=|1-λ 4-2λ 2| ï¼ãc2+c1*2ã
-1 2-λ -2
1 0 a-λ
=|3-λ 0 6| ï¼ãr1-r2*2ã
-1 2-λ -2
1 0 a-λ
=(2-λ)*|3-λ 6| ï¼ãæc2å±å¼ã
1 a-λ
=(2-λ)[3a-6-(3+a)λ+λ^2]
ä¸é¢ï¼è¡åå¼=|2-λ 2-λ 2-λ| ï¼ãr1+r2+r3ã
1 -λ 1
1 1 -λ
=(2-λ)*|1 1 1| ï¼ãæåºå
¬å åã
1 -λ 1
1 1 -λ
=(2-λ)*|1 1 1|
0 -1-λ 0 ï¼ãr2-r1ã
0 0 -1-λ ï¼ãr3-r1ãããä¸ä¸è§ãã
=ï¼2-λ)(1+λ)(1+λ)
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