bonjour
A = 3 x² + 5 x - 15 x - 25 + 20 x² - 8 x - 10 x + 4
a = 23 x² - 28 x - 21
C = 8 x² - 20 x - 10 x + 25 - ( 8 x² - 12 x + 2 x - 3 )
C = 8 x² - 30 x + 25 - 8 x² + 12 x - 2 x + 3
C = - 20 x + 28
A = 6 ( x + y )
B = 10 ( 2 - 3 a) = 10 ( - a )
C = 5 ( 3 a - 5 b )
D = 3 a ( 3a + 4 )
E = 5 x ( 3 x + 1 )
F = 4 x ( 4 x + 6 )
