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Sagot :

Bonjour,

C=  (2x-1) ( 2x-1 +4x+3)

=  (2x-1) ( 6x +2)

D =

25= 5²

identité remarquable a²-b² = (a-b) (a+b)

(3x+5 -5) (3x+5 +5)

= (3x) ( 3x+10)

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