Bonjour
Développer.
A = ( 1/2x - 3) (x + 2/3)
A = 1/2x² + 2/6x - 3x - 6/3
A = 1/2x² + 1/3x - 3x - 6/3
A = 1/2x² + 1/3x - 9/3x - 6/3
A = 1/2x² - 8/3x - 2
B = (3/5x - 1) (1/3x + 15)
B = 3/15x² + 45/5x - 1/3x - 15
B = 1/5x² + 9x - 1/3x - 15
B = 1/5x² + 27/3x - 1/3x - 15
B = 1/2x² + 26/3x - 15
C = (x + 1/3) (x - 1/2)
C = x² - 1/2x + 1/3x - 1/6
C = x² - 3/6x + 2/6x - 1/6
C = x² - 1/6x - 1/6
D = (x - 5/3) (x - 1/15)
D = x² - 1/15x - 5/3x + 5/45
D = x² - 1/15x - 25/15x + 1/9
D = x² - 26/15x + 1/9.
