SVPPP AIDEZ MOI POUR LES ÉTOILES .. A-D-E !!

a]
x - (2 - x) = 2(1 - x)
x - 2 + x = 2 - 2x
2x + 2x = 2 + 2
4x = 4
x = 4/4
x = 1

d]
(2x + 1)/2 = (5x + 3 - x)/4
4(2x + 1) = 2(4x + 3)
8x + 4 = 8x + 6
8x - 8x = 6 - 4
0x = 2
Pas de solution

e]
4(x + 5) = 10(3x + 2)
4x + 20 = 30x + 20
20 - 20 = 30x - 4x
0 = 26x
0/26 = x
0 = x

Exercice 226:

a/
x -2 + x = 2 -2x 
2x +2x = 2 +2    
4x = 4
x =4/4       
x = 1



e/  
4x +20 = 30x +20  
4x -30x = 20 - 20  
-26x = 0 
x = 0


  
d/
(4x + 2) /4 = (5x + 3 - x)/4
4x + 2= 5x + 3 - x
4x - 5x + x =  3 - 2
5x - 5x = 1
0x = 1

Aucun solution