help pour les exercices numéros 32,34 et 35.... Pergunta de ideia dePrancer32

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help pour les exercices numéros 32,34 et 35

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Bellazelda Exercice 32:

a) 3a-11=a+15
3a-11+11-a=a+15-a+11
2a=26
2a/2=26/2
a=13

b)2-4b=-3b-5 (pour le -5 pas sûre donc tu modifieras sur ta feuille)
2-4b-2+3b=-3b-5+3b-2
-b=-7
-b/-1=-7/-1
b=7

c)-5a-3=a-15
-5a-3+3-a=a-15+3
-6a=-12
-6a/-6=-12/-6
a= 2

d)7x-5==-3x+2
7x-5+5+3x=-3x+2+3x+5
10x=7
10x/10=7/10
x= 0.7

e)5x+6=3x+6
5x+6-6-3x=3x+6-3x-6
2x=0
x=0

f)3x-5=3x+7
3x-5+5-3x=3x+7-3x+5
x = pas de solution (car 3x-3x= 0)

Exercice 34:
a)5x=0
x=0

b)5+x=0
5+x-5=0-5
x=-5

c)5-x=0
5-x-5=0-5
-x/-1=-5/-1
x=5

d)5x=1
5x/5=1/5
x=0.2

e)5+x=1
5+x-5=1-5
x=-4

f)5-x=1
5-x-5=1-5
-x/-1=-4/-1
x=4

Exercice 35:
a)-3+x=0
-3+x+3=0+3
x=3

b)x-3=0
x-3+3=0+3
x=3

c)3x=-1
3x/3=-1/3
x=-1/3

d)1/3x=1
1/3x*3/1=1*3/1
x=3

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