résoudre les équations!!!! :o a) 5x - 25 = 0 b) 3x + 1 =7 c) 7x + 13 = - 2 d) 4x - 3 = 0 e) 4 - 3x = 11 f) 5 - x = 7
Mathématiques
lolipoop82
Question
résoudre les équations!!!! :o
a) 5x - 25 = 0
b) 3x + 1 =7
c) 7x + 13 = - 2
d) 4x - 3 = 0
e) 4 - 3x = 11
f) 5 - x = 7
a) 5x - 25 = 0
b) 3x + 1 =7
c) 7x + 13 = - 2
d) 4x - 3 = 0
e) 4 - 3x = 11
f) 5 - x = 7
2 Réponse
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1. Réponse maudmarine
a) 5x - 25 = 0
5x = 25
x = 25/5
x = 5
b) 3x + 1 =7
3x = 7 - 1
3x = 6
x = 6/3
x = 3
c) 7x + 13 = - 2
7x = - 2 - 13
7x = - 15
x = - 15/7
x = - 7,5
d) 4x - 3 = 0
4x = 3
x = 3/4
x = 0,75
e) 4 - 3x = 11
- 3x = 11 - 4
- 3x = 7
x = - 7/3
f) 5 - x = 7
- x = 7 - 5
- x = 2
x = - 2 -
2. Réponse Anonyme
a) 5x-25 = 0
5x = 25
x = 5
b) 3x+1 = 7
3x =-1+7
x = 2
c) 7x+13 = -2
7x =-13-2
x = -15/7
d) 4x-3 = 0
4x = 3
x = 3/4
e) 4-3x = 11
-3x =-4+11
-3x = 7
x =-7/3
f) 5-x = 7
-x =-5+7
x = -2