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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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Calculamos la inversa <strong>de</strong> la matriz B:| B | = –3 ? 0 8 Existe B –1a ijÄÄÄ8 Adj (B) ÄÄÄ8 (Adj (B)) t 1ÄÄÄ8 (Adj (B)) t| B|–2 1 –2 –1 –2 1 –1 –2 1( )))8( ) 8(8(= B –1–1 2 1 2 –1 2 3 –1 22. Calcula la inversa <strong>de</strong> cada una <strong>de</strong> las siguientes matrices:4 –1 0)1 4A =( ) B = 0 2 12 7(1 5 3Calculamos la inversa <strong>de</strong> la matriz A:| A | = –1 ? 0 8 Existe A –1a ijÄÄÄ8 Adj (A) ÄÄÄ8 (Adj (A)) t 1ÄÄÄ8 (Adj (A)) t| A|7 2 7 –2 7 –4 7 –4( )))8( ) 8(8(= A –14 1 –4 1 –2 1 –2 1Calculamos la inversa <strong>de</strong> la matriz B:| B | = 3 ? 0 8 Existe B –1a ijÄÄÄ8 Adj (B) ÄÄÄ8 (Adj (B)) t 1ÄÄÄ8 (Adj (B)) t| B|(1 –1 –2)–3 12 21–1 4 81 1 –2)1 3 –1)1 3 –1)8 3 12 –2118 1 12 –4 8 1 12 –4 = B –1(–1 –4 8 (–2 –21 83 (–2 –21 818Unidad 3. <strong>Resolución</strong> <strong>de</strong> <strong>sistemas</strong> <strong>mediante</strong> <strong>de</strong>terminantes

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