Quiz — ex8c-3-.pdf

Question 1 sur 10 20:00

[{"id":35760,"question":"Quelle est la limite de la fonction f(x) = (3x² + 2x - 1)\/(x² - 4) lorsque x tend vers l'infini ?","option_a":"A. 3","option_b":"B. 0","option_c":"C. -3","option_d":"D. +∞","option_e":"","option_f":"","bonne_reponse":"a","explication":"La limite d'un rapport de polynômes de même degré s'obtient en divisant les coefficients des termes de plus haut degré. Ici, 3x²\/x² = 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\": \"A. 3\", \"b\": \"B. 0\", \"c\": \"C. -3\", \"d\": \"D. +∞\"}}","_debug_options_count":4},{"id":35761,"question":"La fonction f(x) = x³ - 3x² + 2x est-elle strictement croissante sur ℝ ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"La dérivée f'(x) = 3x² - 6x + 2 s'annule en deux points (discriminant positif), donc la fonction n'est pas strictement croissante sur tout ℝ.","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":35762,"question":"Quel est le résultat de l'intégrale ∫(2x + 1)dx entre 0 et 2 ?","option_a":"A. 4","option_b":"B. 6","option_c":"C. 8","option_d":"D. 10","option_e":"","option_f":"","bonne_reponse":"c","explication":"L'intégrale d'une fonction linéaire s'obtient en calculant [x² + x] entre 0 et 2, soit (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\": \"c\", \"options\": {\"a\": \"A. 4\", \"b\": \"B. 6\", \"c\": \"C. 8\", \"d\": \"D. 10\"}}","_debug_options_count":4},{"id":35763,"question":"La suite uₙ définie par u₀ = 1 et uₙ₊₁ = 2uₙ + 3 est-elle arithmétique ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Une suite arithmétique a une différence constante entre deux termes consécutifs. Ici, uₙ₊₁ - uₙ = uₙ + 3, qui n'est pas constant.","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":35764,"question":"Quel est le produit scalaire de deux vecteurs u(2, -1, 3) et v(-1, 4, 2) ?","option_a":"A. 0","option_b":"B. 4","option_c":"C. -4","option_d":"D. 8","option_e":"","option_f":"","bonne_reponse":"c","explication":"Le produit scalaire se calcule par u·v = (2)(-1) + (-1)(4) + (3)(2) = -2 -4 +6 = 0.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"A. 0\", \"b\": \"B. 4\", \"c\": \"C. -4\", \"d\": \"D. 8\"}}","_debug_options_count":4},{"id":35765,"question":"La fonction exponentielle est-elle toujours positive sur ℝ ?","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 pour tout x ∈ ℝ.","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":35766,"question":"Quelle est la solution de l'équation ln(x) = 2 ?","option_a":"A. x = 0","option_b":"B. x = e²","option_c":"C. x = 100","option_d":"D. x = 2","option_e":"","option_f":"","bonne_reponse":"b","explication":"L'équation ln(x) = 2 équivaut à x = e², car ln(e²) = 2 par définition du logarithme.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"A. x = 0\", \"b\": \"B. x = e²\", \"c\": \"C. x = 100\", \"d\": \"D. x = 2\"}","_debug_options_count":4},{"id":35767,"question":"Un dé équilibré à 6 faces est lancé deux fois. Quelle est la probabilité d'obtenir deux fois le chiffre 4 ?","option_a":"A. 1\/6","option_b":"B. 1\/12","option_c":"C. 1\/36","option_d":"D. 1\/18","option_e":"","option_f":"","bonne_reponse":"c","explication":"La probabilité d'obtenir 4 une fois est 1\/6. Pour deux lancers indépendants, la probabilité est (1\/6) × (1\/6) = 1\/36.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"A. 1\/6\", \"b\": \"B. 1\/12\", \"c\": \"C. 1\/36\", \"d\": \"D. 1\/18\"}}","_debug_options_count":4},{"id":35768,"question":"La matrice A = [[1, 2], [3, 4]] est-elle inversible ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Une matrice 2x2 est inversible si son déterminant est non nul. Ici, det(A) = (1)(4) - (2)(3) = -2 ≠ 0, donc elle est inversible.","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":35769,"question":"Quelle est la dérivée de la fonction f(x) = sin(3x) ?","option_a":"A. 3sin(3x)","option_b":"B. cos(3x)","option_c":"C. 3cos(3x)","option_d":"D. -3cos(3x)","option_e":"","option_f":"","bonne_reponse":"c","explication":"La dérivée de sin(u) est u'cos(u). Ici, u = 3x, donc u' = 3, d'où f'(x) = 3cos(3x).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"A. 3sin(3x)\", \"b\": \"B. cos(3x)\", \"c\": \"C. 3cos(3x)\", \"d\": \"D. -3c","_debug_options_count":4}]