Devoir Mathématiques 2ème année Economie et services

Date : 24/02/2021                                           Devoir de contrôle n°_{2                                 L . S . Indépendance}

Durée : 30 mn                                                          Mathématiques                                     prof : A . Fethia

                                                                                        2^ème ECO _{1  et  2}

Exercice N°1 : (6 points)

Soit   une S .G  telle que U₂ = 20   et  U₅ = 160

• Trouver q la raison de cette suite

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• Calculer U₀

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….

• Exprimer U_n en fonction de n

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• Calculer S la somme des 5 premiers termes de cette suite

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Exercice N°2 : (8 points)

Soit  une fonction affine définie par :

• Calculer ;  ;  et

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• Déterminer l’ensemble de définition  de

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• Traçer C_f la courbe de dans un repère orthonormé ( O ; I ; J )         ( page 2 )

Exercice N°3 : (6 points)

C_g   est la représentation graphique d’une fonction affine g

• Déterminer

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• Déterminer graphiquement  et

…………………………………………………………………………………………………………

…………………………………………………………………………………………………………

• Donner l’expression de

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Exercice 2 question 3