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Louise93
@Louise93
May 2019
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Bonsoir,
Je dois faire des exercices de maths et je n'arrive pas. Aidez-moi, s'il vous plaît? Ex 28 à 31.
Merci d'avance.
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Undeuxtrois123
Bonjour on met les x d'un côté
3x + 2 = 44
3x= 44 - 2
3x/3=42/3
x = 14
67= 7x+11
67-11=7x
7x=56
7x/7=56/7
x=8
2x - 30 = 9
2x = 9 + 30
2x = 39
2x/2= 39/2
x =19,5
6x + 12 = 11
6x = 11-12
6x = -1
6x/6= -1/6
x = -1/6
7x + 15 = 6x + 3
7x - 6x= 3 - 15
1x = -12/1
x =-12
-1/3x + 3 = 2/3x -2
-1/3x-2/3x = -2-3
-1x/-1= -5/-1
-x= -5
x= 5
3,2+8x =9x-5,1
8x-9x=-5,1-3,2
-1x=-8,3
-1x/-1 =-8,3/-1
x=8,3/1
0,9x-4=-0,1x-6
0,9x+0,1x =-6+4
1x/1= -2/1
x = -2
1 votes
Thanks 1
Louise93
merci
Undeuxtrois123
derien
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3x + 2 = 44
3x= 44 - 2
3x/3=42/3
x = 14
67= 7x+11
67-11=7x
7x=56
7x/7=56/7
x=8
2x - 30 = 9
2x = 9 + 30
2x = 39
2x/2= 39/2
x =19,5
6x + 12 = 11
6x = 11-12
6x = -1
6x/6= -1/6
x = -1/6
7x + 15 = 6x + 3
7x - 6x= 3 - 15
1x = -12/1
x =-12
-1/3x + 3 = 2/3x -2
-1/3x-2/3x = -2-3
-1x/-1= -5/-1
-x= -5
x= 5
3,2+8x =9x-5,1
8x-9x=-5,1-3,2
-1x=-8,3
-1x/-1 =-8,3/-1
x=8,3/1
0,9x-4=-0,1x-6
0,9x+0,1x =-6+4
1x/1= -2/1
x = -2