Bonjour, il faut supprimer les parenthèses puis réduire
A = (a + b)(a - b) + (-a-b) + (-a + b)
B = (x + 5)-x-2-(-x-4) + (x - 1)
C = 3 - (a + b)-a-b-3+ (3- a - b)
D = 7+ (a + b)+7+c-d-7-(7-x-y)
A = (a + b)(a - b) + (-a-b) + (-a + b)
B = (x + 5)-x-2-(-x-4) + (x - 1)
C = 3 - (a + b)-a-b-3+ (3- a - b)
D = 7+ (a + b)+7+c-d-7-(7-x-y)
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Réponse:
A = a² - 2a - b²
B = 2x + 6
C = - 3a - 3b + 3
D = x + y + a + b + c - d