Réponse :
bonjour
x - 1 = 3/2
2 x/2 - 2/2 = 3/2
2 x = 3 + 2
2 x = 5
x = 5/2
x + 1 = 2 x - 1
x - 2 x = - 1 - 1
- x = - 2
x = 2
x/2 - 1 = 0
0.5 x = 1
x = 2
2 x - 2 - 8 + 4 x = 3 x - 7
6 x - 3 x = - 7 + 10
3 x = 3
x = 1
x² + x + 1 = ( x + 1 ) ( x - 1 )
x² + x + 1 = x² - 1
x² - x² + x = - 1 - 1
x = - 2
Explications étape par étape :
