A = 2a(4-a)
A = 4*2a-2a*a
A = 8a-2a²
A = -2a²+8a
B = (-3b+1)(2b-1)
B = -3b*2b-3b*-1+1*2b+1*-1
B = -6b²+3b+2b-1
B = -6b²+5b-1
C = -3(2-5c) +( 2c-5)(3c+2)
C = (2-5c) (-3+3c+2)
C = (2-5c) (2c-1)
C = 2*2c-2*1-5c*2c-5c*-1
C = 4c-2-10c²+5c
C = -10c²+9c-2
D = (2-5d)*2d(3d-5)
D = (2*2d-5d*2d)(3d-5)
D = (4d-10d²)(3d-5)
D = 4d*3d-4d*5-10d²*3d*-10d²*-5
D = 12d²-20d-30d^3+50d²
D = -30d^3 +62d²-20d
E = (2e+3)(e-1)-(4+e)(-e+5)
E = 2e²-2e+3e-3 - [ -4e + 20 -e²+5e ]
E = 2e²-2e+3e-3 +4e-20+e²-5e
E = 3e²-23
Pour le F/ réécris le en remplaçant le sqrt par V pour racine carrée ce sera plus lisible