Bonjour,,
Angèle affirme : "Ces équations ont toutes un nombre entier relatif pour solution". Est-ce vrai ?
a. 2 (4x - 5) = 7 - (3 - x)
8x - 10 = 7 - 3 + x
8x - x = 7 - 3 + 10
7x = 14
x = 14/7
x = 2
b. 5x + 1 = (x - 1) + (2x - 4)
5x + 1 = x - 1 + 2x - 4
5x - x - 2x = - 1 - 4 - 1
2x = - 6
x = - 6/2
x = - 3
c. (5x - 2) / 4 = 3x/2
(5x - 2) / 4 = 6x/4
5x - 2 = 6x
5x - 6x = 2
- x = 2
x = - 2
d. (x - 3)² = x (x - 5)
x² - 6x + 9 = x² - 5x
x² - x² - 6x + 5x = - 9
- x = - 9
x = 9
Angèle a raison.
