aider moi pls
developper chaque produit , puis reduire les expressions obtenues si cela possible
A= 3 ( x + 5 ) + ( x + 9 ) ( x - 9 )
B= 4x ( 2x + 7 ) ( 2x - 7 )
C= ( 5x - 1 ) ( 5x + 1) - ( 3x - 4 )
D= (4x - 8 ) ( 4x + 8 ) - 2x ( x + 3 )
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