Bonjour,
Exo 37:
1)
A= (x+7) (2x-5) -(2x-5) (3x+2)
A= (2x-5) [ ( x+7) - ( 3x+2) ]
A= (2x-5) [ x+7-3x-2]
A= ( 2x-5) [ -3x+x+5]
2)
B= (4x-3) (2x+1) -5x(4x-3)
B= (4x-3) [ (2x+1) -5x]
B= ( 4 x-3) [ 2x+1-5x]
B= (4x-3) [ -3x+1]
C= (2x-5) (x+2) - ( 2 x-5) (3x-7)
C= (2x-5) [ (x+2) -(3x-7) ]
C= (2x-5) [ x+2-3x+7]
C= (2x-5) [ -3x+x+9]
voilà pour l'exo 37
