Bonjour
Supprimer les parenthèses puis réduire chaque expression:
A = (x2 - 4x) - (5x2 + 2x - 1)
A = x^2 - 4x - 5x^2 - 2x + 1
A = -4x^2 - 6x + 1
B = - (3 - x + x) + (- 2x + 3x2 - 8)
B = -3 + x - x - 2x + 3x^2 - 8
B = 3x^2 - 2x - 11
C = x-4 - (2 + x) + (x + 5)
C = x - 4 - 2 - x + x + 5
C = x - 1
D = - (x - 8) + (x - 6)-(7 - x)
D = -x + 8 + x - 6 - 7 + x
D = x - 5
E = (x2 + 5x - 4) - (- 2x2 + 9x - 7)
E = x^2 + 5x - 4 + 2x^2 - 9x + 7
E = 3x^2 - 4x + 3
