Répondre :
exercice n 1
A= 45-20-3+2
= 25-3+2
=22+2
= 24
B=24:4x6
=6x6
=36
C=4x5-3x2+5
=20-3x2+5
=40-3+5
=37+5
=42
D=20:4+1-3x2
=5+1-3x2
=10+1-3
=11-3
=18
A= 45-20-3+2
= 25-3+2
=22+2
= 24
B=24:4x6
=6x6
=36
C=4x5-3x2+5
=20-3x2+5
=40-3+5
=37+5
=42
D=20:4+1-3x2
=5+1-3x2
=10+1-3
=11-3
=18