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Sagot :

Bonsoir,

(2a+3) (2a+3)  = 4a² +6a +6a +9 =

4a² +12a +9

2a(2a+6) +9 =

4a² +12a +9

4a² +12a +9 = 4a² +12a +9

C'est vrai :

(2a+3) (2a+3)  = 4a² +6a +6a +9

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