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o ¨ ¢¡ £¢ ¡¤ <br />

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a + b a a<br />

¡ ¨ § a, b ∈ IR<br />

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a a + b a<br />

a a a + b<br />

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abc 0£¢ =<br />

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§<br />

©£©¥ £ ¥§¦ £ ¡ ¡ £ ¤ £ <br />

¡ ¤<br />

a 1 bc<br />

b 1 ac<br />

c 1 ab<br />

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=<br />

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¡ ¨ A =<br />

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<br />

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= b2 (3a + b)<br />

a 2 a 1<br />

b 2 b 1<br />

c 2 c 1<br />

1 0 −1<br />

1 2 1<br />

2 2 3<br />

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§ §<br />

§<br />

¡©¨ 1 2 ¡ 3 ¡ ¡ £ ¢ ¡¢¡£ ¡ £ a b ¡ c<br />

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λ ∈ IR det(A − λI3) = 0<br />

A<br />

¡ ¨ <br />

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<br />

−1 A<br />

<br />

147<br />

<br />

A<br />

<br />

¡ ¨ ¢ x y <br />

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z −1 1 0<br />

1 1 2<br />

3 2 2<br />

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x 1<br />

= 1<br />

¡ <br />

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¢ ¢ <br />

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¡ ¨ α ∈ IR β ∈ IR <br />

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x + y − z = 1<br />

⎧⎪⎨<br />

⎪⎩<br />

−2x − (α + 1)y + (α + 2)z = β − 3<br />

y<br />

z<br />

2x + 2y − (α + 2)z = −β + 3<br />

¢ ¢ α<br />

<br />

β<br />

1

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