Répondre :
a = 12 t - 8
b = 3 x -36
c = 15 t² + 35 t + 3 t +7 = 15 t² + 38 t + 7
d = 16 x² - 88 x + 10 x - 55 = 16 x² - 78 x - 55
e = 20 y + 28 + 14 y + 21 - 2 y² - 3 y = - 2 y² + 31 y + 49
f = 12 - 30 d + 2 d - 5 d² - ( 39 - 52 d + 3 d - 4 d²)
f = - 5 d² - 28 d + 12 - 39 + 52 d - 3 d + 4 d²
f = - d² +21 d - 27
b = 3 x -36
c = 15 t² + 35 t + 3 t +7 = 15 t² + 38 t + 7
d = 16 x² - 88 x + 10 x - 55 = 16 x² - 78 x - 55
e = 20 y + 28 + 14 y + 21 - 2 y² - 3 y = - 2 y² + 31 y + 49
f = 12 - 30 d + 2 d - 5 d² - ( 39 - 52 d + 3 d - 4 d²)
f = - 5 d² - 28 d + 12 - 39 + 52 d - 3 d + 4 d²
f = - d² +21 d - 27
A = 4(3t - 2)
A = 12t - 8
B = (x - 12)*3
B = 3x - 36
C = (5t + 1)(3r + 7)
C = 15tr + 35t + 3r + 7
D = (8x + 5)(2x - 11)
D = 16x² - 88x + 10x - 55
D = 16x² - 78x - 55
E = 4(5y + 7) + (7 - y)(2y + 3)
E = 20y + 28 + 14y + 21 - 2y² - 3y
E = -2y² + 31y + 49
F = (6 + d)(2 - 5d) - (13 + d)(3 - 4d)
F = 12 - 30d + 2d - 5d² - (39 - 52d + 3d - 4d²)
F = 12 - 30d + 2d - 5d² - 39 + 52d - 3d + 4d²
F = -d² + 21d - 27
A = 12t - 8
B = (x - 12)*3
B = 3x - 36
C = (5t + 1)(3r + 7)
C = 15tr + 35t + 3r + 7
D = (8x + 5)(2x - 11)
D = 16x² - 88x + 10x - 55
D = 16x² - 78x - 55
E = 4(5y + 7) + (7 - y)(2y + 3)
E = 20y + 28 + 14y + 21 - 2y² - 3y
E = -2y² + 31y + 49
F = (6 + d)(2 - 5d) - (13 + d)(3 - 4d)
F = 12 - 30d + 2d - 5d² - (39 - 52d + 3d - 4d²)
F = 12 - 30d + 2d - 5d² - 39 + 52d - 3d + 4d²
F = -d² + 21d - 27