Résoudre algébriquement chaque équation : A= 3x-1/2 = -3/4-5x B= 1/4x + 5/2 = -x+1 C= -4/5 + y = 3/10 - 1/2y D= 5/2a + 1/4 = 1/4a + 2/5 Merci de vos aides :)
Mathématiques
Correcteur24
Question
Résoudre algébriquement chaque équation :
A= 3x-1/2 = -3/4-5x
B= 1/4x + 5/2 = -x+1
C= -4/5 + y = 3/10 - 1/2y
D= 5/2a + 1/4 = 1/4a + 2/5
Merci de vos aides :)
A= 3x-1/2 = -3/4-5x
B= 1/4x + 5/2 = -x+1
C= -4/5 + y = 3/10 - 1/2y
D= 5/2a + 1/4 = 1/4a + 2/5
Merci de vos aides :)
1 Réponse
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1. Réponse maudmarine
A= 3x-1/2 = -3/4-5x
A = 3x + 5x = 1/2 - 3/4
A = 12/4x + 20/4x = 2/4 - 3/4
A = 32x = - 1
A = x = - 1/32
B= 1/4x + 5/2 = -x+1
B = 1/4x + x = 2 - 5/2
B = 1/4x + 4/4x = 8/4 - 10/4
B = x + 4x = 8 - 10
B = 5x = - 2
B = x = - 2/5
B = x = - 0,4
C= -4/5 + y = 3/10 - 1/2y
C = y + 1/2y = 3/10 + 4/5
C = 10/10y + 5/10y = 3/10 + 8/10
C = 10y + 5y = 3 + 8
C = 15y = 11
C = y = 11/15
D= 5/2a + 1/4 = 1/4a + 2/5
D = 5/2a - 1/4a = 2/5 - 1/4
D = 25/10a - 5/20a = 8/20 - 5/20
D = 25a - 5a = 8 - 5
D = 20a = 3
D = a = 3/20
D = a = 0,15