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Subject: Re: Exercice pour les jeunes
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Date: Thu, 06 Jun 24 14:09:41 +0000
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From: Richard Hachel <richard.hachel@invalid.fr>
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Le 06/06/2024 à 11:12, kurtz le pirate a écrit :
> 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
> 
> 

 Oh dis donc, héé!!!

 Comment tu fais tout ça? 

 Et après? 

 Et avec :
2x+3y=19
5x+y=15

 Ca marche aussi?

 Tu fais : d = a + b + a'+ b'

 C'est facile, ça...

 R.H.