Bonjour j'ai fais des exercices et j'aimerais savoir si c'est bon :
a) 3(x-1)+2(x+3)= 0
3x-3+2x+6 = 0
5x+3 = 0
5x = 0+3
5x/5 = 3/5
x = 3/5
b) -5(x+2)+3(x-3) = 7
-5x-10+3x-9 = 7
-2x-19 = 7
-2x = 7+19
-2x/2 = 26/2
x = 13
c) 4(-x+1)-2(3x-5) = 0
-4x+4-6x+10 = 0
-10x+14 = 0
-10x = 0-14
-10x/10 = 14/10
x = 7/5
d) 7(2x-6)-4(5x-8) = -5x
14x-42-20x+32 = -5x
-6x-10 = -5x
-10 = -5x+6x
-10/1 = 1x/1
x = -10
bonjour,
a) 3(x-1)+2(x+3)= 0
3x-3+2x+6 = 0
5x+3 = 0
5x = -3
........
b) -5(x+2)+3(x-3) = 7
-5x-10+3x-9 = 7
-2x-19 = 7
-2x = 7+19
-2x/-2 = 26/-2
x = -13
c) 4(-x+1)-2(3x-5) = 0
-4x+4-6x+10 = 0
-10x+14 = 0
-10x = 0-14
-10x/10 = -14/10
x = 7/5
d) 7(2x-6)-4(5x-8) = -5x
14x-42-20x+32 = -5x
-6x-10 = -5x
-10 = -5x+6x
-10/1 = 1x/1
x = -10
ok
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