Réponse :
B = 2y + (y - 3)(y + 5) = 2y + y² + 5y - 3y - 15 = y² + 4y - 15
C = 22 (2 + 3)(3-1) = 22 ( 5)(2) = 220
D = 6t² - (2t-3)(3-1) = 6t² - 6t + 2t + 9 - 3 = 6t² - 4t + 6
E = -2v² - (1-2v)(v+1) = -2v² - v - 1 + 2v² + 2v = v - 1
Explications étape par étape