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Sagot :

= n²+2n+1 - ( n²-2n+1)

= n²+2n+1 - n²+2n -1

=4n

Bonsoir

(n+1)² - (n-1)²  est de la forme a²-b² =(a-b)(a+b) 

(n+1 - n+1)(n+1+n-1) 

(2)( 2n ) = 4n

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