Exercice 1: Soit n E IN 1)
Etudier la parité des nombres suivants :
a = 4n+ 5 ; b = 6n +10 c = 5n² + 5n+3; d = n² +n + 14(n + 6) e = (2n + 1) (2n + 2) + 4n(n² + 1)
f= 6n+7
(On rappelle que le produit de deux entiers pair).
2) En déduire la valeur de g:
g = 7(-1)a - 5(-1)b +3(-1)c+d
3)Montrer que : (-1)ª a + b(−1)+ (−1)ªb + a(−1)ª = 0 ​
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