Bonjour,
Exercice 3
PA
x
x+3
5(x+3) = 5x+15
5x+15 - 2x = 3x+15
3x
3x est multiple de 3
PB
x
-4x
-4x+3
-4( -4x+3) = 16x- 12
16x-12 - 10x = 6x -12
6x -12 + 12 = 6x
6x/2 = 3x
3x est multiple de 3
Exercice 4
PA
x
x-5
10x( x-5) = 10x² -50x
10x² -50x + 2x = 10x² -48x
10x² -48x +1
PB
x
-7x
-7x+6
2x( -7x +6) = -14x² +12x
-14x² +12x -10x = -14x² +12x
-14x² +12x -14
