Réponse :

a) A= 2x+1+x+x+x                                

=2x+3x+1

=2×1+3×1+1

=2+3+1

=6

B=2+x²+2

=4+2×2

=4+4

=8

b) A=2x+3x+1

=2×3+3×3+1

=6+9+1

=16

B=2+x²+2

=2+3²+2

=2+9+2

=13

c) 2×x+1+x+x=2+x³+2

4x+1=4+x³

faux