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From: kurtz le pirate <kurtzlepirate@free.fr>
Newsgroups: fr.sci.maths
Subject: Re: Exercice pour les jeunes
Date: Thu, 6 Jun 2024 11:12:03 +0200
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On 01/06/2024 14:22, Richard Hachel wrote:
> On pose :
> 3x+y=13
> x+3y=15
> 
> Baccalauréat S : Toulon, cession de septembre 2023.
> 
> J'ai essayé comme ceci:
> 3x+y=13
> z=13 
> Z=3x-2y+2y+3y
> 
> Z=9x+4-2y+(-6x+6x)
> 
> Z=8+a²-2ab+b²
>  d'où x=2 et y=1.

Au plus simple :

    | 3  1 |           | 13 1 |            | 3 13 |
d = |      | = 8, dx = |      | = 24, dy = |      | = 32
    | 1  3 |           | 15 3 |            | 1 15 |

    dx          dy
x = -- = 3, y = -- = 4
     d           d



>
> Que pensez-vous de cette nouvelle méthode?

ben mauvaise, car elle est fausse


-- 
Kurtz le pirate
Compagnie de la Banquise