Réponse :
Explications étape par étape
Bonsoir
A = 5/7 + 21/7 x 1/9
A = 5/7 + 21/9 x 1/7
A = 5/7 + 7/3 x 1/7
A = 5/7 + 7/21
A = 15/21 + 7/21
A = 22/21
B = (-8x + 7)^2
B = 64x^2 - 112x + 49
C = x^2 - (3x - 1)(x - 7)
C = x^2 - (3x^2 - 21x - x + 7)
C = x^2 - 3x^2 + 22x - 7
C = -2x^2 + 22x - 7
D) 4x - 8 < 8x + 4
-4 - 8 < 8x - 4x
-12 < 4x
x > -12/4
x > -3
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Réponse :
Explications étape par étape
Bonsoir
A = 5/7 + 21/7 x 1/9
A = 5/7 + 21/9 x 1/7
A = 5/7 + 7/3 x 1/7
A = 5/7 + 7/21
A = 15/21 + 7/21
A = 22/21
B = (-8x + 7)^2
B = 64x^2 - 112x + 49
C = x^2 - (3x - 1)(x - 7)
C = x^2 - (3x^2 - 21x - x + 7)
C = x^2 - 3x^2 + 22x - 7
C = -2x^2 + 22x - 7
D) 4x - 8 < 8x + 4
-4 - 8 < 8x - 4x
-12 < 4x
x > -12/4
x > -3