a. 3x = 2x + 5 b. 4 - 5x = 9x c. 4x + 2 = x + 11 d. 3x -7 = -2x - 9 e. 5x -1 = 7x -1 f. 3x - 2 + x = 6 + 4x
Mathématiques
daella974
Question
a. 3x = 2x + 5
b. 4 - 5x = 9x
c. 4x + 2 = x + 11
d. 3x -7 = -2x - 9
e. 5x -1 = 7x -1
f. 3x - 2 + x = 6 + 4x
b. 4 - 5x = 9x
c. 4x + 2 = x + 11
d. 3x -7 = -2x - 9
e. 5x -1 = 7x -1
f. 3x - 2 + x = 6 + 4x
2 Réponse
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1. Réponse maudmarine
A. 3x = 2x + 5 3x - 2x = 5
x = 5
b. 4 - 5x = 9x
- 5x - 9x = - 4
- 14x = - 4
x = 4/14
x = 2/7
c. 4x + 2 = x + 11
4x - x = 11 - 2
3x = 9
x = 9/3
x = 3
d. 3x -7 = -2x - 9
3x + 2x = - 9 + 7
5x = - 2
x = - 2/5
x = - 0,4
e. 5x -1 = 7x -1
5x - 7x = - 1 + 1
- 2x = 0
x = 0
f. 3x - 2 + x = 6 + 4x
3x + x - 4x = 6 + 2
0x = 8 = Impossible -
2. Réponse winner123
bonjour
a) 3 x = 2 x + 5
3 x - 2 x = 5
x = 5
b) 4 - 5 x = 9 x
- 5 x - 9 x = - 4
- 14 x = - 4
x = 4/14 = 2/7
c) 4 x + 2 = x + 11
4 x - x = 11 - 2
3 x = 9
x = 9/3 = 3
d) 3 x - 7 = - 2 x - 9
3 x + 2 x = - 9 + 7
5 x = - 2
x = - 2/5
e) 5 x - 1 = 7 x - 1
5 x - 7 x = - 1 + 1
- 2 x = 0
x = 0
f) 3 x - 2 + x = 6 + 4 x
3 x + x - 4 x = 6 + 2
0 x = 8