On considere l'egalite suivante: 7x + 3 = - 2x + 1 Justifier pourquoi on a alors: a) 9x + 3 = 1; b) 7x = - 2x - 2; c) 7x + 2 = - 2x;
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Question
On considere l'egalite 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.
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.
2 Réponse
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1. Réponse Quantum
a)7x+2x+3=-2x+2x+1
9x+3=1
b)7x+3-3=-2x+1-3
7x=-2x-2
c)7x+3-1=-2x-1+1
7x+2=-2x
d)7x-7x+3=-2x-7x+1
3=-9x+1 -
2. Réponse ajaxamine
x=-2/9
7x=-2x+1-3
7x+2x=-2
9x=-2
x=-2/9