Réponses

Meilleure réponse !
2014-09-24T20:17:19+02:00
3x-1 = -13
3x = -13+1
3x = -12
x = -4


-2x+5=8
-2x+5-8=0
-2x-3=0
-2x=3
x = -1,5

5x=0
x=0

4-x = 7
4-7 = x
x=-3

11x-3 = 2x+9
11x-2x = 9+3
9x = 12
3x = 4
x = 4/3


x/7 = (-7/4)

x = 7 (-7/4)
x = -49/4


(-2x-5)(3x+2) = 0

-2x-5=0: x = - 2,5

3x+2=0: 3x = -2: x = -2/3  


x² = 50
x = + racine(50) ou - racine(50)