Bonjour aider moi
Pour chacune de ces expressions :
a. Recopie les expressions suivantes
en rajoutant les signes × sous-entendus.
b. Calcule-les pour x = 2 :
A = 2x
B = 4x +5
C = 4(x – 3)(x + 8)
D = 3x – 2(5x – 15)
E = 9x2
F = 7 – 2x
G = 2(3x – 2)
H = x(x + 2) – 4x
I = 4x² – 2x(4 – x)
J = – 3x² + 5x – 4
Pour chacune de ces expressions :
a. Recopie les expressions suivantes
en rajoutant les signes × sous-entendus.
b. Calcule-les pour x = 2 :
A = 2x
B = 4x +5
C = 4(x – 3)(x + 8)
D = 3x – 2(5x – 15)
E = 9x2
F = 7 – 2x
G = 2(3x – 2)
H = x(x + 2) – 4x
I = 4x² – 2x(4 – x)
J = – 3x² + 5x – 4
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a)
A = 2 * x
B = 4 * x + 5
C = 4 * (x - 3) * (x + 8)
D = 3 * x - 2 * (5 * x - 15)
E = 9 * x²
F= 7 - 2 * x
G= 2 * (3 * x - 2)
H = x * ( x + 2 ) - 4 * x
I= 4 * x² - 2 * x * (4 - x)
J = 3 * x² + 5 * x - 4
b)
A = 2 * 2 = 4
B = 4 * 2 + 5 = 13
C = 4 * (2 -3) * (2 + 8) = 4 * (-1) * 10 =-40
D = 3 * 2 - 2 * (5 * 2 - 15) = 6 - 2 * (10 - 15) = 6 - (-10) = 6 + 10 = 16
E= 9 * 2² = 36
F = 7 - 2 * 2 = 3
G = 2 * (3 * 2 - 2) = 2 * (6 - 2) = 8
H = 2 * (2 + 2) - 4 * 2 = 2 * 4 - 4 * 2 = 0
I = 4 * 2² - 2 * 2 * (4 - 2) = 16 - 8 = 8
J = 3 * 2² + 5 * 2 - 4 = 12 + 10 - 4 = 18
Bonne soirée