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UBA - CienciaS • Ver Tema - [Resuelto] 17/05/03 EJ 4
UBACS Q&A Foro WikiCS
Fecha actual 11 May 2024, 16:50

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Autor Mensaje
 Asunto: [Resuelto] 17/05/03 EJ 4
NotaPublicado: 30 Ago 2008, 13:48 
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Registrado: 16 May 2008, 23:00
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Necesito ayuda con este:

Sean a,b enteros tales que (a:b)=1. Hallar todos los posibles valores de:




Lo que intenté hacer yo: pedazo de resolucion q no c si esta bien XD


Gracias Agustín por el aporte del final =P

Edit:Ya lo terminé :P


Última edición por Pape el 30 Ago 2008, 18:02, editado 1 vez en total


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Pape Trataremos de buscarle una solución más útil que el famoso "reinicie el equipo y vea si mejora"
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 Asunto: Re: [A Resolver] 17/05/03 EJ 4
NotaPublicado: 30 Ago 2008, 15:54 
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Registrado: 17 May 2008, 23:04
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Vos conclúíste que de haber un primo como divisor, es ; o sea, obtuviste que los posibles valores del mcd son de la forma . Ahora bien, simplemente estudiá módulo 3; fijate que no son posibles casos(verificalo; si supones , vas a obtener . Lo mismo suponiendo , obtenés . Y claramente no pueden valer simultánemanete, por ser coprimos ). O sea, . El bonito resultado es que vale Fermat, o sea, (recordá que vale por ser primo). Luego, tomando módulo 3 en cada número, queda:


O sea, nunca son divisibles por . Luego, siempre (es decir, si no son divisibles por 3, nunca van a ser divisibles por alguna potencia de 3).
Fijate si te sirve el planteo, o si hay algún problema con el mismo. Saludos.



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I offer her that kernel of myself that I have saved, somehow; the central heart that deals not in words, traffics not with dreams and is untouched by time, by joy, by adversities
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 Asunto: Re: [A Resolver] 17/05/03 EJ 4
NotaPublicado: 30 Ago 2008, 16:22 
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:shock: tenes razón...viste yo dije q "si no me estaba olvidando de nada" era 3....Gracias por la aclaración



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