bonjour
je te montre mais il est bien entendu hors de question de faire tout
x + 7 = 0
x = - 7
x - 1 = 0
x = 1
x + 7 = 2 x + 4
x - 2 x = 4 - 7
- x = - 3
x = 3
continue, il suffit de mettre les x d'un côté et les nombres de l'autre
- 3 x = 4
x = - 4/3
3 ( x² - 1 ) - ( 3 x + 1 ) ( x + 1 ) = 0
3 ( x - 1 ) ( x + 1 ) - ( 3 x + 1 ) ( x + 1 ) = 0
( x + 1 ) ( 3 x - 3 - 3x - 1 ) = 0
( x + 1 ) ( - 4 ) = 0
- 4 x - 4 = 0
- 4 x = 4
x = - 1
( x + 2 ) /4 = 1/2
2 x + 4 = 4
2 x = 4 - 4
2 x = 0
x = 0
3 / ( x + 2) = 5/3
5 x + 10 = 9
5 x = 9 - 10
5 x = - 1
x = - 1 /5
( x + 3 ) / ( x - 1 ) = 5/6 - ( - 1/2 )
( x + 3 ) / ( x - 1 ) = 5/6 + 3 /6 = 8/6
6 x + 18 = 8 x- 8
6 x - 8 x = - 8 - 18
- 2 x = - 26
x = 13
je t'ai montré ceux qui me paraissaient un plus plus compliqué donc tu as des exemples
5 x /7 + x = - 3
5 x /7 + 7 x /7 = - 21 /7
12 x = - 21
x = - 21/12 = - 7 /4
2/9 + x /2 = x
4/18 + 9 x /18 = 18 x / 18
9 x - 18 x = - 4
- 9 x = - 4
x = 4/9
continue
