bonjour
x
x + 1
- 4 ( x + 1 ) = - 4 x - 4
- 4 x - 4 - x = - 5 x - 4
(- 5 x - 4 ) / - 2
si on choisit - 5.7 : ( - 5 * - 5.7 - 4 ) / - 2 = 24.5 / - 2 = - 12.25
si on choisit 3 = ( - 15 - 4 ) / - 2 = - 19 / - 2 = 9.5
si on choisit - 11 = ( 55 - 4 ) / - 2 = - 25.5
(- 5 x - 4 ) : - 2 = 0
( - 5 x - 4 ) x - 1/2 = 0
5 x /2 + 4/2 = 0
5 x /2 = - 4 /2
5 x = - 4
x = - 4/5
elle a choisi - 4/5
(- 4/5 * - 5 - 4 ) : - 2
= (20/5 - 4 ) : - 2
= ( 4 - 4 ) : 2 = 0
