Quiz — correction partie d'exercice 3 et ex4.pdf

Question 1 sur 10 20:00

[{"id":28430,"question":"Quelle est la dérivée de la fonction f(x) = x³ - 2x² + 5 ?","option_a":"3x² - 4x","option_b":"x² - 4x","option_c":"3x² - 4x + 5","option_d":"x³ - 4x","option_e":"","option_f":"","bonne_reponse":"a","explication":"La dérivée d'une fonction polynôme s'obtient en appliquant la règle de dérivation terme à terme : (x^n)' = n*x^(n-1).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"3x² - 4x\", \"b\": \"x² - 4x\", \"c\": \"3x² - 4x + 5\", \"d\": \"x³ - 4x","_debug_options_count":4},{"id":28431,"question":"L'intégrale de f(x) = 2x entre 0 et 3 est égale à 9.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'intégrale de 2x est x². Entre 0 et 3, cela donne 3² - 0² = 9.","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":28432,"question":"Quel est le sens de variation de la fonction f(x) = x² - 4x + 3 ?","option_a":"Croissante sur ℝ","option_b":"Décroissante puis croissante","option_c":"Croissante puis décroissante","option_d":"Constante","option_e":"","option_f":"","bonne_reponse":"b","explication":"La dérivée f'(x) = 2x - 4 s'annule en x=2. La fonction est décroissante avant 2 et croissante après.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Croissante sur ℝ\", \"b\": \"Décroissante puis croissante\", \"c\": \"","_debug_options_count":4},{"id":28433,"question":"La limite de (sin x)\/x quand x tend vers 0 est égale à 1.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"C'est une limite fondamentale en analyse : lim(x→0) sin(x)\/x = 1.","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":28434,"question":"Quelle est la solution de l'équation différentielle y' + 2y = 0 ?","option_a":"y = Ce^(-2x)","option_b":"y = Ce^(2x)","option_c":"y = C + e^(-2x)","option_d":"y = C - 2x","option_e":"","option_f":"","bonne_reponse":"a","explication":"C'est une équation différentielle linéaire du premier ordre. La solution générale est y = Ce^(-2x).","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 = Ce^(2x)\", \"c\": \"y = C + e^(-2x)\", \"d\": \"","_debug_options_count":4},{"id":28435,"question":"Le discriminant d'un polynôme du second degré ax² + bx + c est toujours positif.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Le discriminant Δ = b² - 4ac peut être positif, nul ou négatif selon les valeurs de a, b et c.","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":28436,"question":"Quelle est l'aire sous la courbe de f(x) = x² entre 0 et 2 ?","option_a":"8\/3","option_b":"4","option_c":"2","option_d":"16\/3","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'aire est donnée par l'intégrale ∫₀² x² dx = [x³\/3]₀² = 8\/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\": \"8\/3\", \"b\": \"4\", \"c\": \"2\", \"d\": \"16\/3\"}}","_debug_options_count":4},{"id":28437,"question":"La fonction exponentielle est toujours croissante sur ℝ.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"La dérivée de e^x est e^x, qui est toujours positive. La fonction est donc strictement croissante.","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":28438,"question":"Quelle est la primitive de f(x) = 3x² - 2x + 1 ?","option_a":"x³ - x² + x + C","option_b":"x³ - x² + C","option_c":"3x³ - x² + x + C","option_d":"x³ - 2x² + x + C","option_e":"","option_f":"","bonne_reponse":"a","explication":"La primitive s'obtient en intégrant terme à terme : ∫(3x² - 2x + 1)dx = x³ - x² + x + C.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"x³ - x² + x + C\", \"b\": \"x³ - x² + C\", \"c\": \"3x³ - x² + x + ","_debug_options_count":4},{"id":28439,"question":"Le théorème des valeurs intermédiaires s'applique à toute fonction continue sur un intervalle fermé.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Le théorème des valeurs intermédiaires stipule que si f est continue sur [a,b] et k entre f(a) et f(b), alors il existe c dans [a,b] tel que f(c)=k.","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}]