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Universidade Federal do Esp´ırito Santo Centro de Cieˆncias Agra´rias - CCA Respostas da Prova Substitutiva de Vetores e GA 1. (a) ( − 2√ 104 , 6√ 104 ,− 8√ 104 ) . (b) ( − 3√ 26 , 9√ 26 ,− 12√ 26 ) . 2. (a) z = 4 ou z = −4. (b) 12√ 8 . 3. (a) m = 3 4 e n = −15 4 (b) P = ( − 5 24 ,−1,−5 6 ) . PROVA 1 4. (a) θ = arccos ( − 13√ 182 ) . (b) ( 6a 14 ,−3a 14 , 9a 14 ) 5. −→u = (2√3, 0, 2) ou −→u = (√3, 2, 3) 6. −−→ MN = 5 6 −−→ AD PROVA 2 4. m = 6, m = −1, m = 3, m = 2 5. P = ( 5 4 ,−3 4 , 1 2 ) 6. Paralelas coincidentes. PROVA 3 4. pi : − 112 x− 52y + z − 112 = 0. 5. (a) r : x = 2− 2t y = 1− 3t z = 4 + 3t (b) P1 = ( 20 11 , 8 11 , 47 11 ) (c) √ 22 11 6. 0