Bonjour voici mon exercice :
Montrer que

n
Ε i =  \frac{n(n+1)}{2} ( Ε correspond à Sigma )
i=1

Sachant que P(x) = ax²+bx+c

et il faut trouver a, b et c pour que P(x+1) - P(x) = x

Merci :D
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