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  • 18-02-2024
  • Mathematics
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On désigne un nombre naturel non nul.
On pose A=0,9n/n et B=0,9n 1/n 1
a)Montrer que B/A = 0,9 n/n+1
b)Justifier que n/n+1 ≤ 1
c)Pour tout nombre n≥1, comparer alors A et B

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