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Elcia
@Elcia
May 2019
2
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Bonjours a tout et a tous,
Pouvez-vous m'aider a un devoirs cela me ferai grand plaisir.
x=3. et y= -2
A=5(x2+3)-x
B=4x2+2x+3
C=2(x2+y)-3(-x2+x-y)
D=-x-y. Je n'arrive pas a fair au carré desolé.
Merci pour se qui me repondront.
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telephone16
Verified answer
Bonjour
valeur de x = 3 valeur de y = -2
A =5(x² +3) -x
5( 3² +3) -3
5 ( 9 +3) -3
5 ( 12) -3
60 -3 = 57
B = 4x² +2x +3
4 X 3² +2 X3 +3
4 X 9 +6 +3
36 +6 +3 = 45
C=2(x²+ y)-3(-x² + x-y)
2(3²- 2) - 3(-3²+ 3 - (-2))
2(9 - 2) - 3(-9 + 3 + 2)
2 X 7 - 3 X (-4)
14 + 12
26
D= -x -y.
-3 - (-2)
-3 + 2
-1
1 votes
Thanks 0
telephone16
de rien, bonne journée
telephone16
oui
telephone16
oui, c'est cela
telephone16
pas de soucis !
Stiaen
-3²= - (3²)= -9 alors que (-3)² = 9
loulakar
Verified answer
Bonjour Elcia,
x=3 et y= -2
A=5(x^2+3)-x
A = 5(3^2 + 3) - 3
A = 5(9 + 3) - 3
A = 5 * 12 - 3
A = 60 - 3
A = 57
B=4x^2+2x+3
B = 4 * 3^2 + 2 * 3 + 3
B = 4 * 9 + 6 + 3
B = 36 + 9
B = 45
C=2(x^2 + y)-3(-x^2 + x-y)
C = 2(3^2 - 2) - 3(-3^2 + 3 - (-2))
C = 2(9 - 2) - 3(-9 + 3 + 2)
C = 2 * 7 - 3 * (-4)
C = 14 + 12
C = 26
D=-x-y.
D = -3 - (-2)
D = -3 + 2
D = -1
0 votes
Thanks 0
loulakar
2 - 3 = -1 il n’y a pas de (-) devant le 2
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Lista de comentários
Verified answer
Bonjourvaleur de x = 3 valeur de y = -2
A =5(x² +3) -x
5( 3² +3) -3
5 ( 9 +3) -3
5 ( 12) -3
60 -3 = 57
B = 4x² +2x +3
4 X 3² +2 X3 +3
4 X 9 +6 +3
36 +6 +3 = 45
C=2(x²+ y)-3(-x² + x-y)
2(3²- 2) - 3(-3²+ 3 - (-2))
2(9 - 2) - 3(-9 + 3 + 2)
2 X 7 - 3 X (-4)
14 + 12
26
D= -x -y.
-3 - (-2)
-3 + 2
-1
Verified answer
Bonjour Elcia,x=3 et y= -2
A=5(x^2+3)-x
A = 5(3^2 + 3) - 3
A = 5(9 + 3) - 3
A = 5 * 12 - 3
A = 60 - 3
A = 57
B=4x^2+2x+3
B = 4 * 3^2 + 2 * 3 + 3
B = 4 * 9 + 6 + 3
B = 36 + 9
B = 45
C=2(x^2 + y)-3(-x^2 + x-y)
C = 2(3^2 - 2) - 3(-3^2 + 3 - (-2))
C = 2(9 - 2) - 3(-9 + 3 + 2)
C = 2 * 7 - 3 * (-4)
C = 14 + 12
C = 26
D=-x-y.
D = -3 - (-2)
D = -3 + 2
D = -1