ÉQUATIONS ! :) 19 points à gagner :D 6x + 4(2 - 5x) = 7x 9 - 2x = -3(4 - x) 3(x + 1) = x + 6 -2(3x + 5) = 7 + x MERCI D'AVANCE ! :b
Mathématiques
Intello564
Question
ÉQUATIONS ! :) 19 points à gagner :D
6x + 4(2 - 5x) = 7x 9 - 2x = -3(4 - x)
3(x + 1) = x + 6 -2(3x + 5) = 7 + x
MERCI D'AVANCE ! :b
6x + 4(2 - 5x) = 7x 9 - 2x = -3(4 - x)
3(x + 1) = x + 6 -2(3x + 5) = 7 + x
MERCI D'AVANCE ! :b
1 Réponse
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1. Réponse maudmarine
6x + 4(2 - 5x) = 7x
6x + 8 - 20x = 7x
6x - 20x - 7x = - 8
- 19x = - 8
x = 8/19
9 - 2x = -3(4 - x)
9 - 2x = - 12 + 3x
- 2x - 3x = - 12 - 9
5x = 21
x = 21/5
x = 4,2
3(x + 1) = x + 6
3x + 3 = x + 6
3x - x = 6 - 3
2x = 3
x = 3/2
x = 1,5
-2(3x + 5) = 7 + x
- 6x - 10 = 7 + x
- 6x - x = 7 + 10
- 7x = 17
x = 17/7