February 2021 0 68 Report
Bonjour je suis entain de faire un exercice et je ne comprend pas mon erreur !sur les suites Un= 3n²

un+1-un= 3(n+1)² - 3n²
= 3(n²+2n+2) -3n²
= 3n²+6n+6 -3n²
= 6n+6

Alrors que normalement on doit trouver 6n+3

J'attend votre reponse !
Merci
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