Quiz — 66225637bc727_corrigé_Série 52 (2).pdf

Question 1 sur 10 20:00

[{"id":28770,"question":"Quelle est la solution de l'équation : 2x² - 5x + 2 = 0 ?","option_a":"x = 1 ou x = 2","option_b":"x = 0,5 ou x = 2","option_c":"x = -1 ou x = 2","option_d":"x = 1 ou x = -2","option_e":"","option_f":"","bonne_reponse":"b","explication":"Résolvez l'équation en utilisant la formule du discriminant Δ = b² - 4ac. Ici, Δ = 25 - 16 = 9, donc x = (5 ± 3)\/4.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"x = 1 ou x = 2\", \"b\": \"x = 0,5 ou x = 2\", \"c\": \"x = -1 ou x = 2\",","_debug_options_count":4},{"id":28771,"question":"La fonction f(x) = x³ - 3x² + 2x est croissante sur l'intervalle [0, 2].","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Calculez la dérivée f'(x) = 3x² - 6x + 2. Résolvez f'(x) \u003E 0 pour trouver les intervalles de croissance. Ici, f'(x) \u003C 0 sur [0, 2].","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":28772,"question":"Quelle est la limite de la fonction f(x) = (x² - 1)\/(x - 1) lorsque 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":"d","explication":"Factorisez le numérateur : (x² - 1) = (x - 1)(x + 1). La fonction se simplifie en f(x) = x + 1 pour x ≠ 1. La limite est donc 2.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"d\", \"options\": {\"a\": \"0\", \"b\": \"1\", \"c\": \"2\", \"d\": \"La limite n'existe pas\"}}","_debug_options_count":4},{"id":28773,"question":"Dans une classe de 30 élèves, 18 sont des filles. Quelle est la probabilité de choisir une fille au hasard ?","option_a":"0,4","option_b":"0,6","option_c":"0,5","option_d":"0,3","option_e":"","option_f":"","bonne_reponse":"b","explication":"La probabilité est le rapport du nombre de cas favorables (18 filles) sur le nombre total de cas (30 élèves). P = 18\/30 = 0,6.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"0,4\", \"b\": \"0,6\", \"c\": \"0,5\", \"d\": \"0,3\"}}","_debug_options_count":4},{"id":28774,"question":"La suite (uₙ) définie par uₙ = 2n + 1 est arithmétique.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Une suite est arithmétique si la différence entre deux termes consécutifs est constante. Ici, uₙ₊₁ - uₙ = 2, donc la suite est arithmétique de raison 2.","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":28775,"question":"Quelle est la dérivée de la fonction f(x) = ln(x² + 1) ?","option_a":"f'(x) = 2x\/(x² + 1)","option_b":"f'(x) = 1\/(x² + 1)","option_c":"f'(x) = x\/(x² + 1)","option_d":"f'(x) = 2x","option_e":"","option_f":"","bonne_reponse":"a","explication":"Appliquez la règle de dérivation des fonctions composées : f'(x) = (1\/(x² + 1)) * (2x) = 2x\/(x² + 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\": \"f'(x) = 2x\/(x² + 1)\", \"b\": \"f'(x) = 1\/(x² + 1)\", \"c\": \"f'(x) = ","_debug_options_count":4},{"id":28776,"question":"Un dé est lancé deux fois. Quelle est la probabilité d'obtenir deux fois le même nombre ?","option_a":"1\/6","option_b":"1\/36","option_c":"1\/18","option_d":"1\/12","option_e":"","option_f":"","bonne_reponse":"a","explication":"Il y a 6 résultats possibles pour chaque lancer. La probabilité d'obtenir le même nombre deux fois est (6\/36) = 1\/6.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"1\/6\", \"b\": \"1\/36\", \"c\": \"1\/18\", \"d\": \"1\/12\"}}","_debug_options_count":4},{"id":28777,"question":"La fonction f(x) = eˣ est toujours positive.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"La fonction exponentielle eˣ est strictement positive pour tout x réel, car eˣ \u003E 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},{"id":28778,"question":"Résolvez l'inéquation : 3x - 2 ≤ 5x + 4.","option_a":"x ≥ -3","option_b":"x ≤ -3","option_c":"x ≥ 3","option_d":"x ≤ 3","option_e":"","option_f":"","bonne_reponse":"b","explication":"Réarrangez l'inéquation : 3x - 5x ≤ 4 + 2 → -2x ≤ 6 → x ≥ -3 (en divisant par un nombre négatif, on inverse le sens de l'inégalité).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"x ≥ -3\", \"b\": \"x ≤ -3\", \"c\": \"x ≥ 3\", \"d\": \"x ≤ 3\"}}","_debug_options_count":4},{"id":28779,"question":"Quelle est l'intégrale de f(x) = 2x + 1 entre 0 et 2 ?","option_a":"4","option_b":"5","option_c":"6","option_d":"8","option_e":"","option_f":"","bonne_reponse":"b","explication":"Calculez l'intégrale : ∫(2x + 1)dx = x² + x. Évaluez entre 0 et 2 : (4 + 2) - (0 + 0) = 6.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"4\", \"b\": \"5\", \"c\": \"6\", \"d\": \"8\"}}","_debug_options_count":4}]