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Rawelle
@Rawelle
May 2019
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Salut j'ai besoin d'aide pour mon exercice c'est très urgent
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sila2002
Verified answer
A. -2x + 2 = 2x -2
-2x-2x = -2-2
-4x = -4
x = -4/-4
x = 1
b. x-8 = 2x-9
x-2x = -9+8
-x = -1
x = 1
c'est ça ???
1 votes
Thanks 0
RomainVTT
oui, ta réponse est juste
sila2002
<3
RomainVTT
Verified answer
Bonjour,
il faut faire passer tous les termes du même côté, sans oublier de changer le signe, puis regrouper les "x" et les "non x" et effectuer les opérations puis résoudre.
ainsi :
a) -2x +2 = 2x -2
=> -2x +2 -2x +2 = 0
=> -2x -2x +2 +2 = 0
=> -4x +4 = 0
=> 4x = 4
=> x = 4/4 = 1
(-> vérification :
-2x +2 = 2x -2 => -(2*1) +2 = (2*1) -2 => -2 +2 = 2 -2 => 0 = 0)
b) x -8 = 2x -9
=> x -8 -2x +9 = 0
=> x -2x -8 +9 = 0
=> -x +1 = 0
=> -x = -1
=> x = 1
(-> vérification : x -8 = 2x -9 => 1 -8 = (2*1) -9 => -7 = -7)
2 votes
Thanks 0
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Lista de comentários
Verified answer
A. -2x + 2 = 2x -2-2x-2x = -2-2
-4x = -4
x = -4/-4
x = 1
b. x-8 = 2x-9
x-2x = -9+8
-x = -1
x = 1
c'est ça ???
Verified answer
Bonjour,il faut faire passer tous les termes du même côté, sans oublier de changer le signe, puis regrouper les "x" et les "non x" et effectuer les opérations puis résoudre.
ainsi :
a) -2x +2 = 2x -2
=> -2x +2 -2x +2 = 0
=> -2x -2x +2 +2 = 0
=> -4x +4 = 0
=> 4x = 4
=> x = 4/4 = 1
(-> vérification : -2x +2 = 2x -2 => -(2*1) +2 = (2*1) -2 => -2 +2 = 2 -2 => 0 = 0)
b) x -8 = 2x -9
=> x -8 -2x +9 = 0
=> x -2x -8 +9 = 0
=> -x +1 = 0
=> -x = -1
=> x = 1
(-> vérification : x -8 = 2x -9 => 1 -8 = (2*1) -9 => -7 = -7)