Développer A=5+(2a-7)
B=5 (2x-7)
C = 5-(2b-7)
D = 5 (y + 3)-3 (y + 4)
E =(5-t) (t-6)
F = -8 (3 + c) (c-2)
G=-8 (3+a) + (a-2)
H = (2z + 1) (z + 3) + (3z-1) (2z-5)
I = (2a-1)(a +5)-(2a-1) (5a + 4)
J = 5b (2b-1) +2 (3b+7) (b-2)
K = ( 6a - 1)(a + 3)-2 (6a-1) (3a + 7)
L = (x + 3)² + (x + 2)²
M = (2a + 5)² + (2a - 5)²
N = (2z + 5y) (2z - 5y)
O=(3e-7)²-(3e+7)²
P= (r+ 5)²-(2r-10) (r-4)
Q=1²-4-(t+2) (3t-5)
R=(u + 3) (2u +1)+4 (u²-9)​