(0 )2 1436587@9BAC9EDGF4HI 7P5QHRFTSVU0DXW6F4H
(0 )2 1436587@9BAC9EDGF4HI 7P5QHRFTSVU0DXW6F4H
(0 )2 1436587@9BAC9EDGF4HI 7P5QHRFTSVU0DXW6F4H
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64 CAPÍTULO 6. ¥£ ¦£¥¡ ¤§ ¦£¡<br />
<br />
<br />
<br />
<br />
0 a a2 a−1 0 a<br />
a−2 a−1 0<br />
<br />
<br />
<br />
= −a<br />
a−1 a<br />
a−2 <br />
<br />
0 + a2 <br />
<br />
a−1 0<br />
a−2 a−1 <br />
<br />
<br />
¨¥ ¨ ¤£ ¡ 1 A <br />
<br />
det A =<br />
= −a (−aa −2 ) + a 2 (a −1 a −1 ) = 2a 2 a −2 = 2a 0 = 2 = 0<br />
<br />
A<br />
¡ ¨ a ∈ IR \ {0}<br />
<br />
<br />
−5 det C = 4<br />
¡ ¨ A B C n det A = 2 det B =<br />
<br />
<br />
det (ABC) det<br />
<br />
(3B)<br />
A B C ¢ ¨ det (C −1 )<br />
¨¥ ¨ <br />
<br />
<br />
det (ABC) = (det A) (det B) (det C) = −40<br />
det (3B) = 3 n det B = −5 × 3 n<br />
det A T B −1 <br />
det A det B det C ¢ ¢ A B C<br />
¢ ¨ <br />
det (C−1 ) = 1<br />
det C<br />
= 1<br />
4<br />
det A T B −1 = det A T det (B −1 ) = det A det (B −1 ) =<br />
det (AB) = det (BA)<br />
¡ ¨ A B n<br />
AB ¡ ¨ £¢ A B ¡ ¢ <br />
<br />
<br />
det A<br />
det B<br />
¨¥ ¨ <br />
det (AB) = (det A) (det B) = (det B) (det A) = det (BA)<br />
= − 2<br />
5<br />
AB ¡ ¨ £¢ det (AB) = 0 det (AB) =<br />
(det A) (det B)