Mathematics, 17.02.2021 14:10, dragongacha777

Exercice 2 Soit (Un) la suite définie sur N par U = -3n+4.
1) Calculer U, ;U, et U2.
2) Montrer que (Un) est une suite arithmétique.
n
3) Calculer Sn = U=U, +U, +...+Un en fonction de n.
k=1
4) Déterminer l'entier n pour lequel U = -89.
5) Calculer S=U, +U6 + ... +
U 23
Exercice 3
TTT

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Exercice 2 Soit (Un) la suite définie sur N par U = -3n+4.
1) Calculer U, ;U, et U2.
2) M...