20 Écris le plus simplement possible.
A = 3x axb
B = 3 xa + 3xb
C = 8xax 2
D=5+3xb
E = 5xa+3+2
F=2×3×a×(bx c)
G=7xaxbx3
H=7+ axb+3
1 = 3x (2 x a + b) × 5
J= (2,51) xaxb