Bonjour,
nbre pair:
2k
Nbre impair:
2k+1
(2k+1)²
= 4k² +4k +1
4k² + 4k: pair
+1, le rend impair
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Bonjour,
nbre pair:
2k
Nbre impair:
2k+1
(2k+1)²
= 4k² +4k +1
4k² + 4k: pair
+1, le rend impair