bonjour
A = ( 9 x - 7 )² = identité remarquable
A = 81 x² - 126 x + 49
B = 11 x - 5 x² + 99 - 45 x = - 5 x² - 34 x + 99
c = ( 2 x - 3 ) ( 2 x + 3 ) = identité
C = 4 x² - 9
D = ( 11 + 9 x )² = identité
D = 121 + 198 x + 81 x²
E = ( x + 1 )² + 7 x ( 2 - x )
E = x² + 2 x + 1 + 14 x - 7 x²
E = - 6 x² + 16 x + 1
