12.07.2015 Views

Tema 3: Resolución de sistemas mediante determinantes

Tema 3: Resolución de sistemas mediante determinantes

Tema 3: Resolución de sistemas mediante determinantes

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UNIDAD3c) 3x + y – z = 0x + y + z = 03x + 2y – 2z = 1|3 1 0|| A z| = 1 1 0 = 23 2 1°§¢§£|3 1 –1| A | = 1 1 1 = –63 2 –2|0 1 –1||3 0 –1|| A x| = 0 1 1 = 2; | A y| = 1 0 1 = –4;1 2 –23 1 –2|–1 2Por tanto: x = , y = , z =3 3–13d) x + y – z + t =1x – y – t =2z – t =01 1 –1 1 1)A' = 1 –1 0 –1 2(0 0 1 –1 01442443A|1 1 –1|Tenemos que 1 –1 0 = –2 ? 0.0 0 1|1 – t 1 –12 + t –1 0 |t 0 1 –3 – t 3 + tx = = =–2–2 21 1 – t –1| 1 2 + t 0 |0 t 1 1 + t –1 – ty = = =–2 –2 21 1 1 – t| 1 –1 2 + t |0 0 t –2tz = = = t–2 –2Soluciones:3 + l( ,–1 – l, l, l)2°§¢§£2s10Estudia y, cuando sea posible, resuelve:° x – y = 6° x + y – z = –2§§a) ¢ 4x + y =–1b) ¢ 2x – y –3z =–3§§£ 5x +2y =–5£ x –2y –2z = 0Unidad 3. <strong>Resolución</strong> <strong>de</strong> <strong>sistemas</strong> <strong>mediante</strong> <strong>de</strong>terminantes25

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