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Bonjour, j'ai eu un DM de mathématique sur les équations et à cet exercice j'ai rien compris :
4(x+2)=x-1          5x+1=(x-1)+(2x-4)       3x-1-(1+2x)=1     x/3+1=0 
Merci d'avance

Sagot :

4(x+2)=x-1
4x+8=x-1
4x-x=-1-8
3x=-9
x=-3

5x+1=(x-1)+(2x-4)
5x+1=x-1+2x-4
5x-x-2x=-1-4-1
2x=-6
x=-3

3x-1-(1+2x)=1
3x-1-1-2x=1
3x-2x=1+1+1
x=3

x/3+1=0
x/3=-1
x=-1x3
x=-3
TELEPHONE16
4(x+2)= x -1
4x +8 = x -1
4x -x = -8 -1
3x = -9
x = -9/3 = -3

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

3x -1 - ( 1+2x) = 1
3x -1 -1 -2x = 1
x -2 = 1
x = 2 +1
x = 3


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