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Anissaaissou
@Anissaaissou
April 2019
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DM pour demain URGENT
J'avais poster ce dm hier mais je n'ai eu aucunes reponses j'espere en avoir maintenant c'est tres important :S
(l'exo n°4 nest pas a faire mais il est facultatif)
Merci de m'aider au moins pour 3 eexercices
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winner123
Verified answer
Bonsoir
A = 5 ( 3 x -1) + ( -3) ( 2 x +5)
A = 15 x - 5 + ( - 6 x - 15)
A = 15 x - 5 - 6 x - 15
a = 9 x - 20
B = ( x +2) ( x +1) + (x +1)
B = x² + x + 2 x +2+x+1
B = x² + 4 x +3
C = (9 x -8) (3 x -5) - 7( 9 x - 8)
C = ( 27 x² - 45 x - 24 x +40) - (63 x - 56)
C = 27 x² - 69 x +40 - 63 x + 56
C = 27 x² - 132 x + 96
N°2
A = 6 xy - 30 x + 18 y
A = 6 x ( y - 5 + 3 y)
A = 6 x ( 4 y - 5)
B = ( x +2) ( x +1) + ( x +1)
B = ( x +1) ( x +2 + 1)
B = ( x +1) ( x +3)
C = ( 9 x - 8) ( 3 x -5) - 7 ( 9 x -8)
C = ( 9 x -8) ( 3 x - 5 - 7)
c = ( 9 x -8) ( 3 x - 12)
N°3
K = (2 x +3) (2 x -3) - ( 2 x +3) ( x-1)
K = 4 x² - 6 x + 6 x - 9 - ( 2 x² - 2 x + 3 x - 3)
K = 4 x² - 9 - 2 x² + 2 x - 3 x + 3
K = 2 x² - x - 6
K = ( 2 x +3) ( 2 x - 3 - x + 1)
K = ( 2 x +3 ) ( x - 2)
pour x = 0.5
K = ( 2 x 0.5 + 3) ( 0.5 - 2)
K = 4 x - 1.5
K =
- 6
Soit x le magasin 1
magasin 2 = x + 45
magasin 3 = x + 45 + 60
x + x +45 +x + 45 +60 = 210
3 x = 210 - 45 - 45 - 60
3 x = 60
x = 20
20 € dans le magasin 1
65 dans le 2
125 dans le 3
N°5
A = ( 3 x +6)² - 3 x
A = 9 x² + 36 x + 36 - 3x
A = 9 x² + 33 x + 36
B = ( x -7)² + 9 x
B = x² - 14 x + 49 + 9 x
B = x² - 5 x + 49
C = ( 4 x -9 ) ( 4 x +9) - ( 15 x² + 88)
C = 16 x² - 81 - 15 x² - 88
C = x² - 169
N°6
A= 36 - 60 x + 25 x²
A = ( 5 x - 6)²
B = 9 x² + 42 x +49
B = ( 3 x + 7)²
C = 1 - 16 y²
C = ( 1 - 4 y)(1 + 4y)
N°7
L = 3 ( x² - 49) - ( 2 x + 7)²
L = 3 x² - 147 - ( 4 x² + 28 x +49)
L = 3 x² - 147 - 4 x² - 28 x - 49
L = - x² - 28 x -196
4 x ² -49 = ( 2 x -7) ( 2x +7)
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DM de svt Merci de m'aider les exos sont assez rapides ce sont des questions (pas de calculs)
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Verified answer
BonsoirA = 5 ( 3 x -1) + ( -3) ( 2 x +5)
A = 15 x - 5 + ( - 6 x - 15)
A = 15 x - 5 - 6 x - 15
a = 9 x - 20
B = ( x +2) ( x +1) + (x +1)
B = x² + x + 2 x +2+x+1
B = x² + 4 x +3
C = (9 x -8) (3 x -5) - 7( 9 x - 8)
C = ( 27 x² - 45 x - 24 x +40) - (63 x - 56)
C = 27 x² - 69 x +40 - 63 x + 56
C = 27 x² - 132 x + 96
N°2
A = 6 xy - 30 x + 18 y
A = 6 x ( y - 5 + 3 y)
A = 6 x ( 4 y - 5)
B = ( x +2) ( x +1) + ( x +1)
B = ( x +1) ( x +2 + 1)
B = ( x +1) ( x +3)
C = ( 9 x - 8) ( 3 x -5) - 7 ( 9 x -8)
C = ( 9 x -8) ( 3 x - 5 - 7)
c = ( 9 x -8) ( 3 x - 12)
N°3
K = (2 x +3) (2 x -3) - ( 2 x +3) ( x-1)
K = 4 x² - 6 x + 6 x - 9 - ( 2 x² - 2 x + 3 x - 3)
K = 4 x² - 9 - 2 x² + 2 x - 3 x + 3
K = 2 x² - x - 6
K = ( 2 x +3) ( 2 x - 3 - x + 1)
K = ( 2 x +3 ) ( x - 2)
pour x = 0.5
K = ( 2 x 0.5 + 3) ( 0.5 - 2)
K = 4 x - 1.5
K = - 6
Soit x le magasin 1
magasin 2 = x + 45
magasin 3 = x + 45 + 60
x + x +45 +x + 45 +60 = 210
3 x = 210 - 45 - 45 - 60
3 x = 60
x = 20
20 € dans le magasin 1
65 dans le 2
125 dans le 3
N°5
A = ( 3 x +6)² - 3 x
A = 9 x² + 36 x + 36 - 3x
A = 9 x² + 33 x + 36
B = ( x -7)² + 9 x
B = x² - 14 x + 49 + 9 x
B = x² - 5 x + 49
C = ( 4 x -9 ) ( 4 x +9) - ( 15 x² + 88)
C = 16 x² - 81 - 15 x² - 88
C = x² - 169
N°6
A= 36 - 60 x + 25 x²
A = ( 5 x - 6)²
B = 9 x² + 42 x +49
B = ( 3 x + 7)²
C = 1 - 16 y²
C = ( 1 - 4 y)(1 + 4y)
N°7
L = 3 ( x² - 49) - ( 2 x + 7)²
L = 3 x² - 147 - ( 4 x² + 28 x +49)
L = 3 x² - 147 - 4 x² - 28 x - 49
L = - x² - 28 x -196
4 x ² -49 = ( 2 x -7) ( 2x +7)