Résoudre les équations suivantes 1. 2x + 3 = 5 2. -x +9 = 6x - 1 3. 2\/7 - \/7x = \/28 4. 4x + 3 sur 3x - 5 = 2 5. 7x + 21 = 49 6. 14- 7x = 4x + 48 Je vous rem

Bonjour, 

2x + 3 = 5
2x = 5 - 3
2x = 2
x = 1

- x + 9 = 6x - 1
- x - 6x = - 1 - 9
- 7x = - 10
x = (- 10)/(- 7)
x = 10/7

2√7 - √7x = √28
- √7x = √28 - 2√7
(- √7x)² = (√28)² - (2√7)²
7x = 28 - 28
7x = 0
x = 0

(4x + 3)/(3x - 5) = 2
4x + 3 = 2(3x - 5)
4x + 3 = 6x - 10
4x - 6x = - 10 - 3
- 2x = - 13
x = (- 13)/(- 2)
x = 13/2

14 - 7x = 4x + 48
- 7x - 4x = 48 - 14
- 11x = 34
x = 34/(- 11)
x = - 34/11

Bonne journée! =)