Bonjour je souhaiterais que vous m'aidiez dans cette exercice

Dans chacun des cas, obtenir un encadrement de la valeur de x.
a.-3< x-3<5 b.-10<-X+2<-5
E. d(X×1.5)<0.5
f. d(-2×-X)<8


Merci ​

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Bonjour ! J'ai un DM de maths à faire (niveau première, sur les suites numériques). Et évidemment, je coince sur un exercice :


Soit U0= -1 et Un+1= Un+n+1 pour tout n ≥ 0.

1. a) Calculer ses 5 premiers termes.
b) Cette suite est-elle arithmétique ? géométrique ?

2. On définit la suite (Vn) par Vn= Un+1 - Un.
a) Calculer les 4 premiers termes de (Vn).
b) Montrer que (Vn) est suite arithmétique.

3. a) Calculer V0 + V1 +.

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