Bonjour,
A=20-3×2³
A = 20 - 3 x 8
A = 20 - 24
A = - 4
B=(5+3²)×10
B = (5 + 9) x 10
B = 14 x 10
B = 140
C=3×5²+4
C = 3 x 25 + 5
C = 75 + 4
C = 79
D=(3×5)²+4
D = (15)² + 4
D = 125 + 4
D = 129
E=3×(5²+4)
E = 3 x (25 + 4)
E = 3 x 29
E = 87
F=3×(4+5)²
F = 3 x (9)²
E = 3 x 81
E = 243.