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huart
@huart
January 2021
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Bonjour tous le monde j'ai un DM à rendre pour mercredi et je j'aurais besoin d'aide Merci d'avance à ceux qui aurons répondu
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rosiemuller2000
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Coucou
exercice 2
1) 6x+1=5
6x= 4
x= 4/6
2) 2x+3 = 1/2 -2x
4x = -2,5
x = -5/8
3) (2x+3)(6-3x)=0
revient a resoudre
2x=-3 ou -3x=-6
x= -3/2 ou x=2
4) (3-x)/2 = (x+7)/3
3-x = (2x+14)/3
9-3x = 2x+14
-5x = 5
x = -1
5) 4x²+12x+9 = 0
(2x+3)²=0
revient a resoudre
2x+3=0
2x=-3
x= -3/2
voila j espere t avoir aider
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huart
Merci
rosiemuller2000
de rien ;)
nini999
Verified answer
Bonjour :
L'exercice : 2
1)
6x + 1 = 5
6x = 5 - 1
6x = 4
x = 4/6
x = 2/3
2)
2x + 3 = 1/2 - 2x
2x + 2x = 1/2 - 3
4x = 1/2 - 6/2
4x = -5/2
4x×2 = -5
8x = -5
x = -5/8
3)
(2x + 3)(6 - 3x) = 0
Soit : 2x + 3 = 0 ou 6 - 3x = 0
: 2x = -3 ou -3x = -6
: x = -3/2 ou x = -6/-3
: x = -3/2 ou x = 6/3
Donc: x = -3/2 ou x = 2
4)
3 - x/2 = x + 7/3
3(3 - x)/3(2) = 2(x + 7)/2(3)
3(3 - x) = 2(x + 7)
9 - 3x = 2x + 14
-3x - 2x = 14 - 9
-5x = 5
x = 5/-5
x = -1
5)
4x² + 12 + 9 = 0
(2x)² + 2×2x×3 + 3² = 0
(2x)² + 2×2x×3 + 3² il prend la forme de a²+2ab+b² = (a+b)²
Alors :
(2x + 3)² = 0
(2x + 3)(2x + 3) = 0
Soit : 2x + 3 = 0 ou 2x + 3 = 0
: 2x = -3 ou 2x = -3
Donc: x = -3/2 ou x = -3/2
J’espère t'avoir t'aider
0 votes
Thanks 0
huart
Merci
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Coucouexercice 2
1) 6x+1=5
6x= 4
x= 4/6
2) 2x+3 = 1/2 -2x
4x = -2,5
x = -5/8
3) (2x+3)(6-3x)=0
revient a resoudre
2x=-3 ou -3x=-6
x= -3/2 ou x=2
4) (3-x)/2 = (x+7)/3
3-x = (2x+14)/3
9-3x = 2x+14
-5x = 5
x = -1
5) 4x²+12x+9 = 0
(2x+3)²=0
revient a resoudre
2x+3=0
2x=-3
x= -3/2
voila j espere t avoir aider
Verified answer
Bonjour :L'exercice : 2
1)
6x + 1 = 5
6x = 5 - 1
6x = 4
x = 4/6
x = 2/3
2)
2x + 3 = 1/2 - 2x
2x + 2x = 1/2 - 3
4x = 1/2 - 6/2
4x = -5/2
4x×2 = -5
8x = -5
x = -5/8
3)
(2x + 3)(6 - 3x) = 0
Soit : 2x + 3 = 0 ou 6 - 3x = 0
: 2x = -3 ou -3x = -6
: x = -3/2 ou x = -6/-3
: x = -3/2 ou x = 6/3
Donc: x = -3/2 ou x = 2
4)
3 - x/2 = x + 7/3
3(3 - x)/3(2) = 2(x + 7)/2(3)
3(3 - x) = 2(x + 7)
9 - 3x = 2x + 14
-3x - 2x = 14 - 9
-5x = 5
x = 5/-5
x = -1
5)
4x² + 12 + 9 = 0
(2x)² + 2×2x×3 + 3² = 0
(2x)² + 2×2x×3 + 3² il prend la forme de a²+2ab+b² = (a+b)²
Alors :
(2x + 3)² = 0
(2x + 3)(2x + 3) = 0
Soit : 2x + 3 = 0 ou 2x + 3 = 0
: 2x = -3 ou 2x = -3
Donc: x = -3/2 ou x = -3/2
J’espère t'avoir t'aider