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Ambregzm1
@Ambregzm1
May 2019
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Bonjour jai dm de maths pour demain et je n'y arrive vraiment pas .. Pourriez vous m'aider svp merci d'avance.
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maudmarine
Verified answer
Bonsoir,
Bonsoir,
1-
(2x + 7) (4 - 8x) = 0
2x + 7 = 0 ou 4 - 8x = 0
2x = - 7 ou - 8x = - 4
x = - 7/2 ou x = 4/8
x = - 3,5
ou
x = 1/2
2-
(5x - 9) (3x - 12) = 0
5x - 9 = 0 ou 3x - 12 = 0
5x = 9 ou 3x = 12
x = 9/5 ou x = 12/3
x = 1,8
ou
x = 4
3-
(- 9x - 17) (4 - 12x) = 0
- 9x - 17 = 0 ou 4 - 12x = 0
- 9x = 17 ou - 12x = - 4
x = - 17/9
ou x = 4/12
x = 1/3
4-
5x (7x + 9) = 0
5x = 0 ou 7x + 9 = 0
x = 0
ou 7x = - 9
x = - 9/7
0 votes
Thanks 1
ambregzm1
Merci énormément !!
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Pouvez vous m'aider avec ces exercices merci !
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Verified answer
Bonsoir,Bonsoir,
1-
(2x + 7) (4 - 8x) = 0
2x + 7 = 0 ou 4 - 8x = 0
2x = - 7 ou - 8x = - 4
x = - 7/2 ou x = 4/8
x = - 3,5 ou x = 1/2
2-
(5x - 9) (3x - 12) = 0
5x - 9 = 0 ou 3x - 12 = 0
5x = 9 ou 3x = 12
x = 9/5 ou x = 12/3
x = 1,8 ou x = 4
3-
(- 9x - 17) (4 - 12x) = 0
- 9x - 17 = 0 ou 4 - 12x = 0
- 9x = 17 ou - 12x = - 4
x = - 17/9 ou x = 4/12
x = 1/3
4-
5x (7x + 9) = 0
5x = 0 ou 7x + 9 = 0
x = 0 ou 7x = - 9
x = - 9/7