Matemàtiques avançades: ISBN

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martes, 29 de noviembre de 2011

ISBN

International Standard Book Number
A partir del 2007 l'ISBN té 13 dígits per a semblar-se al sistema de còdig de barres i tenen una estructura dividida en quatre parts:
- Els primers dígits indiquen el país d'origen del producte.
-Els següents el còdig de l'empresa i el còdig del producte.
- L'últim és el còdig de control.
Per comprovar el dígit de control numerem els dígits de drets a esquerra. A continuació si se sumen els dígits de les posicions imparells, el resultat es multiplica per tres i se li sumen els dígits de les posicions pars. Se busca la desena inmediatament superior i se li restael resultat obtingut.El resultat final és del dígit de control. Si el resultat és un múltiple de 10, el dígit de control serà 0.
EX: Trobar el dígit de control de control per a l'ISBN 123456789041
1. Numerem de dreta a esquerra ~~> 140987654321
2. Suma dels números dels llocs imparells ~~> 21
3.Multiplicar per 3 ~~> 63
4. Sumem xifres de la posició par ~~> 29
5. Sumar impars x3 + pars ~~> 63 + 29 = 92
6. Desena superior a 92 ~~> 100
7. 100 - 92 ~~> 8
8

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