bonsoir
A = ( 2 x + 3 ) ( x - 1 ) + 9 x + 3
= 2 x² - 2 x + 3 x - 3 + 9 x +3
= 2 x² + 4 x - 3
B = 2 x /3 ( x + 1 ) - 1 /6
= 2 x² / 3 + 2 x /3 - 4 /6
= 4 x² / 6 + 4 x / 6 - 4 /6
C = ( 3 x + 2 )² - ( 5 - 4 x² )
= 9 x² + 12 x + 4 - ( 25 - 40 x + 16 x ² )
= 9 x² + 12 x + 4 - 25 + 40 x - 16 x²
= - 7 x² + 52 x - 21
D = ( x - 1 ) ( 3 x - 1 + x /4 + 2 )
= ( x - 1 ) ( 3 x + 0.25 x + 1 )
= ( x - 1 ) ( 3 .25 x + 1 )
E = ( 2 x + 3 ) ( x - 1 - 2 x - 3 )
= ( 2 x + 3 ) ( - x - 4 )
F = ( x - 1 /6 ) ( x + 1 /6 )
G = ( 2 x - 2 )²
