Sagot :
bonjour,
A = 21 x² - 18 x - 63 x + 54 + 20 x - 32 + 15 x² - 24 x
A = 36 x² + 85 x + 22
B = 14 x² + 4 x - 63 x - 18 - ( 60 - 10 x - 24 x + 4 x² )
B = 14 x² - 59 x - 18 - 60 + 10 x + 24 x - 4 x²
B = 10 x² - 25 x - 78
C = ( 24 - 9 x) ( 4 x + 5 ) - ( 12 x + 7 ) ( 3 x - 2 )
C = 96 x + 120 - 36 x² - 45 x - ( 36 x² - 24 x + 21 x - 14 )
C = - 36 x² + 51 x + 120 - 36 x² + 24 x - 21 x + 14
C = - 72 x² + 54 x + 134
D = ( 15 x - 7 ) ( 50 x - 16 + 13 - 34 x )
d = ( 15 x - 7 ) ( 16 x - 3 )
E = ( 12 x + 23 ) (26 - x + 15 x + 13 )
E = ( 12 x + 23 ) ( 14 x + 39 )