Sagot :
Coucou, a. x+7=0 b. 3x-5-4 = 0
x = -7 3x-5 = 4
3x = -1
x = -1/3
c. 2x+3 = 4x-3 d. -x+7 = -2x+1
2x+6 = 4x -x+6 = -2x
2x+6 -x+6
——— = x ——— = x
4 -2
x+6
——— = x
2
(Les - s’annulent et donne un +)
x = -7 3x-5 = 4
3x = -1
x = -1/3
c. 2x+3 = 4x-3 d. -x+7 = -2x+1
2x+6 = 4x -x+6 = -2x
2x+6 -x+6
——— = x ——— = x
4 -2
x+6
——— = x
2
(Les - s’annulent et donne un +)