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forum.matefbc.ro • Vezi subiect - Sistem

Sistem

Algebra clasa a9a

Sistem

Mesajde alex2008 » Lun Iun 29, 2009 7:07 pm

Rezolvati urmatorul sistem in numere reale :





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Re: Sistem

Mesajde Pyi » Lun Iun 29, 2009 8:44 pm

Sistemul admite pe langa solutia banala si solutiile:
x=y=z=1
x=y=z=-1
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Re: Sistem

Mesajde alex2008 » Lun Iun 29, 2009 8:57 pm

Si o solutie ? pentru ca sistemul e destul de banal .
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Re: Sistem

Mesajde Intrebatorul » Mar Iun 30, 2009 6:06 pm

Intrebatorul
 
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Re: Sistem

Mesajde alex2008 » Mie Iul 01, 2009 8:20 am

O solutie evidenta este . Acum consideram .

Din sistem avem :

deci au acelasi semn . Analog se arata ca au acelasi semn , deci au acelasi semn .

Acum sa observam ca . Deci avem .

Trebuie sa consideram doua cazuri :

1) . Avem ca . Deci .

2) . Atunci facem substitutiile sistemul se reduce la primul caz si se obtine solutia

Deci solutiile sunt

Acum chiar este corect :D
Ultima oară modificat de alex2008 pe Joi Iul 02, 2009 9:11 pm, modificat 1 dată în total.
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Re: Sistem

Mesajde Intrebatorul » Joi Iul 02, 2009 7:13 pm

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Re: Sistem

Mesajde Pyi » Joi Iul 02, 2009 7:19 pm

Sa sti alex ca problema nu este banala asa cum ai afirmat tu,probabil doar in cazul "dotatilor" in mate,insa te asigur ca problema se poate rezolva mult mai usor ,scurt si rapid decat toate rezolvarile postate pana acum .
Insa eu consider ca subiectul s-a rezolvat fiind avem solutiile deci nu mai trebuie sa palavragim atat :D
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Re: Sistem

Mesajde Intrebatorul » Joi Iul 02, 2009 7:26 pm

Chiar ar fi de dorit sa fie postate mai multe moduri de rezolvare pentru ca asa mai invatam unii de la altii!
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Re: Sistem

Mesajde alex2008 » Joi Iul 02, 2009 8:02 pm

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Re: Sistem

Mesajde Intrebatorul » Vin Iul 03, 2009 6:03 pm

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