Réponse :
Explications étape par étape
Bonsoir
Résoudre les équations :
48 - 5x = 25x + 8
48 - 8 = 25x + 5x
40 = 30x
x = 40/30
x = 4/3
3x + 5 = 2x - 17
3x - 2x = -17 - 5
x = -22
x/3 + 7 = x/6 + 9
2x/6 - x/6 = 9 - 7
x/6 = 2
x = 2 * 6
x = 12
4,3x + 15 = 5,7x + 36
5,7x - 4,3x = 15 - 36
1,4x = -21
x = -21/1,4
x = -15
Exercice 9 :
2(3 - x) + 4(x - 2) = 0
6 - 2x + 4x - 8 = 0
2x - 2 = 0
2x = 2
x = 2/2
x = 1
(1 - x) - (3 + x) = 7
1 - x - 3 - x = 7
-2x = 7 + 2
2x = -9
x = -9/2
3x - 2(x - 4) = 5 + 4(1 - 2x)
3x - 2x + 8 = 5 + 4 - 8x
x + 8 = 9 - 8x
x + 8x = 9 - 8
9x = 1
x = 1/9
x(3x - 1) - 3x(x + 4) = 0
3x^2 - x - 3x^2 - 12x = 0
-13x = 0
x = 0
