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Matematica E Simpla • View topic - Sisteme de 2 ecuatii cu 2 necunoscute

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 Post subject: Sisteme de 2 ecuatii cu 2 necunoscute
PostPosted: Tue Jan 20, 2009 3:37 pm 
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Joined: Mon Dec 01, 2008 3:20 pm
Posts: 14
Location: Ialomita-Ograda
Enunţ:
Câtul a două numere naturale este 7, iar diferenţa lor este 360.
Să se afle cele doua numere. Să se verifice rezultatul.


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 Post subject: Re: Sisteme de 2 ecuatii cu 2 necunoscute
PostPosted: Thu Jan 22, 2009 5:16 pm 
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Joined: Wed Oct 22, 2008 6:27 pm
Posts: 29
Rezolvare:
Notăm cu x şi y cele două numere.

Câtul a două numere naturale este 7.
Deci, x / y = 7.

diferenţa lor este 360.
Deci, x - y = 360.

Din prima ecuaţie îl scotem pe x
x = y * 7
şi îl înlocuim în a doua ecuaţie:
7 * y - y = 360.

Îl aflăm pe y, după care îl aflăm pe x.


Probă:
x / y = ... / ... = 7
x - y = ... - ... = 360


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