Quiz — Serie3-Analyse-Fonctionnelle.pdf

Question 1 sur 10 20:00

[{"id":50318,"question":"Quelle est la dérivée de la fonction f(x) = x² + 3x - 5 ?","option_a":"2x + 3","option_b":"2x² + 3","option_c":"x² + 3","option_d":"2x + 5","option_e":"","option_f":"","bonne_reponse":"a","explication":"La dérivée d'un polynôme s'obtient en appliquant la règle de dérivation terme à terme : (x²)' = 2x, (3x)' = 3 et (-5)' = 0. Donc f'(x) = 2x + 3.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"2x + 3\", \"b\": \"2x² + 3\", \"c\": \"x² + 3\", \"d\": \"2x + 5\"}}","_debug_options_count":4},{"id":50319,"question":"La fonction f(x) = 1\/x est continue sur ℝ.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"La fonction f(x) = 1\/x n'est pas définie en x = 0, donc elle n'est pas continue sur tout ℝ. Elle est continue sur ℝ* (ℝ privé de 0).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":50320,"question":"Quelle est l'intégrale de f(x) = 3x² entre 0 et 2 ?","option_a":"4","option_b":"8","option_c":"12","option_d":"16","option_e":"","option_f":"","bonne_reponse":"c","explication":"L'intégrale de 3x² est x³. Entre 0 et 2, cela donne 2³ - 0³ = 8. L'intégrale vaut donc 8.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"4\", \"b\": \"8\", \"c\": \"12\", \"d\": \"16\"}}","_debug_options_count":4},{"id":50321,"question":"La fonction exponentielle f(x) = e^x vérifie f'(x) = f(x).","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"C'est une propriété fondamentale de la fonction exponentielle : sa dérivée est égale à elle-même.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":50322,"question":"Quelle est la limite de f(x) = (x² - 1)\/(x - 1) quand x tend vers 1 ?","option_a":"0","option_b":"1","option_c":"2","option_d":"La limite n'existe pas","option_e":"","option_f":"","bonne_reponse":"b","explication":"En factorisant le numérateur, on obtient (x - 1)(x + 1)\/(x - 1) = x + 1 pour x ≠ 1. Donc la limite quand x tend vers 1 est 1 + 1 = 2.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"0\", \"b\": \"1\", \"c\": \"2\", \"d\": \"La limite n'existe pas\"}}","_debug_options_count":4},{"id":50323,"question":"La fonction f(x) = x³ - 3x + 2 admet un extremum local en x = 1.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"La dérivée f'(x) = 3x² - 3 s'annule en x = 1 et x = -1. En x = 1, la dérivée change de signe (de négative à positive), donc c'est un minimum local.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":50324,"question":"Quelle est la solution générale de l'équation différentielle y' = 2y ?","option_a":"y = Ce^(2x)","option_b":"y = 2Ce^x","option_c":"y = Ce^x","option_d":"y = 2x + C","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'équation différentielle y' = 2y est une équation à variables séparables. Sa solution générale est y = Ce^(2x), où C est une constante réelle.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"y = Ce^(2x)\", \"b\": \"y = 2Ce^x\", \"c\": \"y = Ce^x\", \"d\": \"y = 2x + C","_debug_options_count":4},{"id":50325,"question":"La fonction f(x) = ln(x) est définie pour tout x réel.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"La fonction logarithme népérien ln(x) n'est définie que pour x \u003E 0. Elle n'est pas définie pour x ≤ 0.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":50326,"question":"Quelle est l'asymptote oblique de la fonction f(x) = (x² + 1)\/x ?","option_a":"y = x","option_b":"y = x + 1","option_c":"y = x - 1","option_d":"y = 2x","option_e":"","option_f":"","bonne_reponse":"a","explication":"En divisant le numérateur par le dénominateur, on obtient f(x) = x + 1\/x. Quand x tend vers ±∞, 1\/x tend vers 0, donc l'asymptote oblique est y = x.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"y = x\", \"b\": \"y = x + 1\", \"c\": \"y = x - 1\", \"d\": \"y = 2x\"}}","_debug_options_count":4},{"id":50327,"question":"La fonction f(x) = e^(-x²) est toujours positive.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"La fonction exponentielle e^u est toujours positive pour tout u réel. Comme -x² est toujours négatif ou nul, e^(-x²) est toujours positif ou nul (égal à 1 en x = 0).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4}]