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MALIKFC
@MALIKFC
January 2021
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Bonsoir à tous,
Je sais que je m'y prend tard mais j'ai un dm de maths à rendre pour demain. Malgré mes efforts, les maths et moi feront toujours deux...
Pourriez-vous m'aider s'il vous plaît?
Merci d'avance pour toutes vos réponses.
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loulakar
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Exercice 1 :
1) Démontrer :
a) x
b) -x
c) -x + 5
d) (-x + 5) * x
e) x(-x + 5) - 6
f) -x^2 + 5x - 6
Donc f(x) = -x^2+5x-6
2) calcul :
f(2) = -(2^2) + 5*(-2) - 6
f(2) = -4 - 10 - 6
f(2) = -20
f(-3) = -(-3)^2 + 5*(-3) - 6
f(-3) = -9 - 15 - 6
f(3) = - 30
3) calcul :
f(-1/7) = -(-1/7)^2+5*(-1/7)-6
f(-1/7) = -1/49 - 5/7 - 6
f(-1/7) = -1/49-35/49-294/49
f(-1/7) = -330/49
f(V2) = -(V2)^2+5V2 - 6
f(V2) = -2 + 5V2 - 6
f(V2) = -8 + 5V2
Exercice 2 :
1) résoudre :
a) 3x + 7 = 4
3x = 4 - 7
x = (-3) / 3
x = (-1)
b) -7x = 0
x = 0
c) -5(3x - 4) = 2x + 6
-15x + 20 = 2x + 6
15x - 2x = 20 - 6
13x = 14
x = 14/13
2) résoudre :
a) 3x - 5 >= 6x + 2
6x - 3x <= -5 - 2
3x <= -7
x <= -7/3
x € ]-inf;-7/3]
b) 2x-3(5x-2)<12-(2-3x)
2x - 15x + 6 < 12 - 2 + 3x
-13x + 6 < 10 + 3x
6 - 10 < 13x + 3
-4 - 3 < 13x
x > -7/13
1 votes
Thanks 1
MALIKFC
Merci beaucoup! C'est très gentil
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January 2021 | 0 Respostas
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Verified answer
Exercice 1 :1) Démontrer :
a) x
b) -x
c) -x + 5
d) (-x + 5) * x
e) x(-x + 5) - 6
f) -x^2 + 5x - 6
Donc f(x) = -x^2+5x-6
2) calcul :
f(2) = -(2^2) + 5*(-2) - 6
f(2) = -4 - 10 - 6
f(2) = -20
f(-3) = -(-3)^2 + 5*(-3) - 6
f(-3) = -9 - 15 - 6
f(3) = - 30
3) calcul :
f(-1/7) = -(-1/7)^2+5*(-1/7)-6
f(-1/7) = -1/49 - 5/7 - 6
f(-1/7) = -1/49-35/49-294/49
f(-1/7) = -330/49
f(V2) = -(V2)^2+5V2 - 6
f(V2) = -2 + 5V2 - 6
f(V2) = -8 + 5V2
Exercice 2 :
1) résoudre :
a) 3x + 7 = 4
3x = 4 - 7
x = (-3) / 3
x = (-1)
b) -7x = 0
x = 0
c) -5(3x - 4) = 2x + 6
-15x + 20 = 2x + 6
15x - 2x = 20 - 6
13x = 14
x = 14/13
2) résoudre :
a) 3x - 5 >= 6x + 2
6x - 3x <= -5 - 2
3x <= -7
x <= -7/3
x € ]-inf;-7/3]
b) 2x-3(5x-2)<12-(2-3x)
2x - 15x + 6 < 12 - 2 + 3x
-13x + 6 < 10 + 3x
6 - 10 < 13x + 3
-4 - 3 < 13x
x > -7/13