Exercice 1: Simplifier les expressions suivantes: A=5x X 4x=
D=4xX3 =
G=-3 x 5x²=
J=-5x (-2x²)=
B=7X3x=
E = 5x²X 2 =
H=4xX (-3x) =
K=-6xX(-4x)=
C=4X2x²=