Aidez moi a faire ces deux exos je n'ai pas très bien compris !! Merci bcp pr ceux qui m'aideront <<3 Exercice 1: Résoudre les équations suivantes: a) 4x+11=2x+

Exercice 1:
a) 4x+11=2x+15
   4x -2x = 15- 11
   2x = 4
     x = 2
b) 3x+2=2x+5
    3x-2x = 5 - 2
       x = 3
c) 5x+3=x+11
    5x -x = 11-3
   4x = 8
    x = 2
d) 5x+5=3x+12
     5x -3x = 12-5
       2x= 7
        x = 7/2
Exercice 2:
   ==> on développe, on simplifie puis on essaye de resoudre les equations :
a) 2(x-5)=3(-x+5)  
  2x -10 = -3x + 15
   5x = 25
   x = 5
b) -(-a+3)=5(3-a)+2
   a - 3 = 15 - 5a + 2
   6a = 20
     a = 20/6 = 10/3
 c) m-(5-2m)=3m-15  
m-5 + 2m = 3m - 15
6m = -10
m = -10/6 = -5/3

Exercice 1:

a) 4x + 11 = 2x + 15
4x + 11 - 11 = 2x + 15 - 11
4x = 2x + 3
4x - 2x = 2x - 2x + 3
2x = 3
x = 3/2
x = 1.5

b) 3x + 2 = 2x + 5
3x - 2x + 2 = 2x - 2x + 5
x + 2 = 5
x + 2 - 2 = 5 - 2
x = 3

c) 5x + 3 = x + 11
5x - x + 3 = x - x + 11
4x + 3 = 11
4x + 3 - 3 = 11 - 3
4x = 8
x = 8/4
x = 2

d) 5x + 5 = 3x + 12
5x - 3x + 5 = 3x - 3x + 12
2x + 5 = 12
2x + 5 - 5 = 12 - 5
2x = 7
x = 7/2


Exercice 2 :

a) 2 ( x - 5 ) = 3 (-x + 5 )
2x - 10 = -3x + 15
2x + 3x - 10 = -3x + 3x + 15
5x + 10 = 15
5x + 10 - 10 = 15 - 10
5x = 5
x = 5/5
x = 1

b) - (-a + 3) = 5 (3 - a) + 2
a - 3 = 5x3 + 5 x (-a) + 2
a - 3 = 15 - 5a + 2
a - a - 3 = 15 - 5a - a + 2
-3 = 15 - 6a + 2
-3 = 15 +2 - 6a
-3 = 17 - 6a
-3 + 6a = 17 - 6a + 6a
-3 + 6a = 17
-3 + 3 + 6a = 17 + 3
6a = 20
a = 20/6
a = 4

c) m-(5-2m) = 3m - 15
m - 5 + m + 2m = 3m - 15
m + m + 2m - 5 = 3m - 15
4m - 5 = 3m - 15
4m - 3m - 5 = 3m - 3m - 15
m - 5 = -15
m - 5 + 5 = -15 + 5
m = -10