bjr qlq peut m’aider pour le 13 et 14

Bonjour,

2(x - 7) = 2x - 14

3(-x + 1) = -3x + 3

2x - 14 = -3x + 3
2x + 3x = 14 + 3
5x = 17
x = 17/5

14)

7(6 - 2x) - 3(4x + 1) = 0
42 - 14x - 12x - 3 = 0
-26x + 39 = 0
26x = 39
x = 39/26
x = (3 x 13)/(2 x 13)
x = 3/2

Bonjour

♧ 13

♤1.

A = 2(x-7)
A = 2×x + 2×(-7)
A = 2x - 14

● Tu fais l'autre même principe ...

♤2.

2(x-7) = 3(-x+1)
2x-14= -3x + 3
2x + 3x = 3 + 14
5x = 17
x = 17/5

♧ 14

7(6-2x)-3(4x+1) = 0
42 - 14x - 12x - 3 = 0
-26x + 39 = 0
- 26x = -39
x = 39/26 = 3/2

Voilà ^^