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Flash05
@Flash05
May 2019
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Bonjour, je voudrais de l'aide en maths s'il vous plait ! Je suis en 4ème.
On considère l'égalité suivante :
7x + 3 = - 2x + 1
Justifier pourquoi on a alors :
A) 9x+3 = 1 B) 7x = -2x-2
C) 7x +2 = -2x D) 3= -9x +1
Aidez moi s'il vous plait je ne comprend pas !
Merci
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Commentaires (2)
A) 9x+3 = 1
a)9x=1-3
a)x=-2/9
B) 7x = -2x-2
b)7x+2x=-2
b)9x=-2
b)x=-2/9
C) 7x +2 = -2x
c)7x+2x=-2
c)9x=-2
c)x=-2/9
D) 3= -9x +1
d)9x=1-3
d)9x=-2
d)x=-2/9
2 votes
Thanks 1
Flash05
Merci énormément !!!!
jennifercassin
A) 7x+3 = -2x+1
tu passes de l'autre côté le -2x qui devient alors 2x
7x+2x+3=1 <=> 9x+3=1
B) 7x+3=-2x+1
7x = -2x+1-3 <=> 7x = -2x-2
C) 7x+3=-2x+1
7x+3-1=-2x
7x+2= -2x
D) 7x+3=-2x+1
3=-2x+1x-7x
3=-9x+1
1 votes
Thanks 1
Flash05
Merci beaucoup
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a)9x=1-3
a)x=-2/9
B) 7x = -2x-2
b)7x+2x=-2
b)9x=-2
b)x=-2/9
C) 7x +2 = -2x
c)7x+2x=-2
c)9x=-2
c)x=-2/9
D) 3= -9x +1
d)9x=1-3
d)9x=-2
d)x=-2/9
tu passes de l'autre côté le -2x qui devient alors 2x
7x+2x+3=1 <=> 9x+3=1
B) 7x+3=-2x+1
7x = -2x+1-3 <=> 7x = -2x-2
C) 7x+3=-2x+1
7x+3-1=-2x
7x+2= -2x
D) 7x+3=-2x+1
3=-2x+1x-7x
3=-9x+1