Quiz : Réviser les maths SMA5 — Fonctions, dérivées et équations

Question 1 sur 10 10:00

[{"id":30038,"question":"Quelle est la dérivée de la fonction f(x) = 3x² + 2x - 5 ?","option_a":"6x + 2","option_b":"6x² + 2","option_c":"3x + 2","option_d":"6x + 5","option_e":"","option_f":"","bonne_reponse":"A","explication":"La dérivée de 3x² est 6x, celle de 2x est 2, et celle de -5 est 0. Donc f'(x) = 6x + 2.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":30039,"question":"L'équation x² - 4x + 4 = 0 admet deux solutions réelles distinctes.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"B","explication":"Le discriminant Δ = 16 - 16 = 0, donc l'équation admet une solution réelle double (x = 2).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":30040,"question":"Quelle est la limite de la fonction f(x) = (2x² + 3x) \/ (x² - 1) quand x tend vers l'infini ?","option_a":"2","option_b":"0","option_c":"1","option_d":"∞","option_e":"","option_f":"","bonne_reponse":"A","explication":"En divisant numérateur et dénominateur par x², on obtient (2 + 3\/x) \/ (1 - 1\/x²), qui tend vers 2\/1 = 2.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":30041,"question":"La fonction f(x) = sin(x) est-elle périodique ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"La fonction sinus a une période de 2π, donc elle est périodique.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":30042,"question":"Résoudre l'inéquation 3x - 7 \u003E 2x + 1.","option_a":"x \u003E 8","option_b":"x \u003C 8","option_c":"x \u003E 6","option_d":"x \u003C 6","option_e":"","option_f":"","bonne_reponse":"A","explication":"En simplifiant, on obtient x \u003E 8.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":30043,"question":"La dérivée de la fonction f(x) = e^(2x) est f'(x) = 2e^(2x).","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"La dérivée de e^(u(x)) est u'(x)e^(u(x)). Ici, u(x) = 2x, donc u'(x) = 2, d'où f'(x) = 2e^(2x).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":30044,"question":"Quelle est la solution de l'équation ln(x) = 2 ?","option_a":"x = e²","option_b":"x = 2","option_c":"x = 100","option_d":"x = ln(2)","option_e":"","option_f":"","bonne_reponse":"A","explication":"Par définition, ln(x) = 2 équivaut à x = e².","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":30045,"question":"La fonction f(x) = x³ - 3x est-elle croissante sur ℝ ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"B","explication":"Sa dérivée f'(x) = 3x² - 3 s'annule en x = ±1, donc la fonction n'est pas croissante sur tout ℝ.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":30046,"question":"Quelle est l'intégrale de la fonction f(x) = 4x³ entre 0 et 2 ?","option_a":"16","option_b":"8","option_c":"32","option_d":"4","option_e":"","option_f":"","bonne_reponse":"A","explication":"L'intégrale de 4x³ est x⁴. Entre 0 et 2, on obtient 2⁴ - 0⁴ = 16.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":30047,"question":"La suite définie par uₙ = 2n + 1 est-elle arithmétique ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"La différence entre deux termes consécutifs est constante (uₙ₊₁ - uₙ = 2), donc la suite est arithmétique.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0}]