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Sagot :

Exo 1 : a) . n
. n+2
. 2(n+2)
b) n+(n+2)+2(n+2)
= n+n+2+2n+4
= 4n+6
c) Si n=7
7+(7+2)+2(7+2)
= 7+9+2x7+2x2
= 7+9+14+4
= 34
d) 6 car si on remplace, 6+(6+2)+2(6+2)=30

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