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Obifa
@Obifa
May 2019
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Bonjour, j'ai besoin d'aide s'il vous plait :
Exercice 1 :
Calcule les expressions pour x = 5 et x = -2
A = x + 2
B = 2x - 3
C = 4(1 - x)
D = x² - 4x + 1
Exercice 2 :
Développer l'expression puis la réduire.
A(x + 2) = ?
n(n +1) = ?
x(5 + x) = ?
2a(a + 5) = ?
2(a + 3) = ?
b(5b - 7) = ?
Merci à ceux qui m'aideront ;)
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aur70
Verified answer
Bonjour
exo1
x=5 :
A = x + 2=5+2=7
B = 2x - 3=2*5-3=7
C = 4(1 - x)=4*(1-5)=-16
D = x² - 4x + 1
=5²-4*5+1=25-20+1=6
x=-2:
A = x + 2=-2+2=0
B = 2x - 3=-2*2-3=-7
C = 4(1 - x)=4(1+2)=12
D = x² - 4x + 1
=4+4*2+1=13
exo2
A(x + 2) = ax+2A
n(n +1) = n²+n
x(5 + x) = 5x+x²
2a(a + 5) = 2a²+10a
2(a + 3) = 2a+6
b(5b - 7) = 5b²-7b
1 votes
Thanks 0
Obifa
Merci à toi!
nadiab
Exercice 1 :
Calcule les expressions pour x = 5 et x = -2
pour x=5
A = x + 2
A= 5+2
A=7
B = 2x - 3
B= 2(5)-3
B= 10-3=7
C = 4(1 - x)
C=4-4x
C=4-4(5)
C= 4-20= -16
D = x² - 4x + 1
D= (5)²-4(5)+1
D= 25-20+1=6
Pour x= -2
A = -2 + 2=0
B = 2x - 3=2(-2)-3=-4-3=-7
C = 4(1 - x)=4-4x=4-4(-2)= 4+8=12
D = x² - 4x + 1 = (-2)²-4(-2)+1= 4+8+1=13
Exercice 2 :
Développer l'expression puis la réduire.
A(x + 2) = Ax+2A
n(n +1) = n²+n
x(5 + x) = 5x+x²
2a(a + 5) = 2a²+10a
2(a + 3) = 2a+6
b(5b - 7) = 5b²-7b
2 votes
Thanks 0
Obifa
Merci beaucoup!
jessibel62
bonjour ! ex 1 : A = 5+2 B = 5x3 C = 4(1-5) D = 5-5 ect...ect...
Obifa
merci mais tout a déjà été rédigé, mais merci comme même pour votre aide
jessibel62
d'accord bah derien
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Bonjour, pouvez vous m'aider svp Quel est le plus grand diviseur commun de 54 et de 300 entre 3, 6 et 2 ? Merci
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Verified answer
Bonjourexo1
x=5 :
A = x + 2=5+2=7
B = 2x - 3=2*5-3=7
C = 4(1 - x)=4*(1-5)=-16
D = x² - 4x + 1 =5²-4*5+1=25-20+1=6
x=-2:
A = x + 2=-2+2=0
B = 2x - 3=-2*2-3=-7
C = 4(1 - x)=4(1+2)=12
D = x² - 4x + 1 =4+4*2+1=13
exo2
A(x + 2) = ax+2A
n(n +1) = n²+n
x(5 + x) = 5x+x²
2a(a + 5) = 2a²+10a
2(a + 3) = 2a+6
b(5b - 7) = 5b²-7b
Calcule les expressions pour x = 5 et x = -2
pour x=5
A = x + 2
A= 5+2
A=7
B = 2x - 3
B= 2(5)-3
B= 10-3=7
C = 4(1 - x)
C=4-4x
C=4-4(5)
C= 4-20= -16
D = x² - 4x + 1
D= (5)²-4(5)+1
D= 25-20+1=6
Pour x= -2
A = -2 + 2=0
B = 2x - 3=2(-2)-3=-4-3=-7
C = 4(1 - x)=4-4x=4-4(-2)= 4+8=12
D = x² - 4x + 1 = (-2)²-4(-2)+1= 4+8+1=13
Exercice 2 :
Développer l'expression puis la réduire.
A(x + 2) = Ax+2A
n(n +1) = n²+n
x(5 + x) = 5x+x²
2a(a + 5) = 2a²+10a
2(a + 3) = 2a+6
b(5b - 7) = 5b²-7b