Quiz — corrigé 15 septembre 2022.pdf

Question 1 sur 10 20:00

[{"id":46708,"question":"Quelle est la limite de la fonction f(x) = (3x² + 2x - 1)\/(x² - 4) lorsque x tend vers +∞ ?","option_a":"A. 0","option_b":"B. 3","option_c":"C. +∞","option_d":"D. -∞","option_e":"","option_f":"","bonne_reponse":"b","explication":"La limite d'un rapport de polynômes de même degré est égale au rapport des 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\": \"b\", \"options\": {\"a\": \"A. 0\", \"b\": \"B. 3\", \"c\": \"C. +∞\", \"d\": \"D. -∞\"}}","_debug_options_count":4},{"id":46709,"question":"Soit une suite géométrique de premier terme u₀ = 2 et de raison q = 1\/2. Quelle est la valeur de u₅ ?","option_a":"A. 2","option_b":"B. 1\/16","option_c":"C. 1\/32","option_d":"D. 1\/64","option_e":"","option_f":"","bonne_reponse":"d","explication":"La formule d'une suite géométrique est uₙ = u₀ × qⁿ. Ici, u₅ = 2 × (1\/2)⁵ = 2 × 1\/32 = 1\/16.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"d\", \"options\": {\"a\": \"A. 2\", \"b\": \"B. 1\/16\", \"c\": \"C. 1\/32\", \"d\": \"D. 1\/64\"}}","_debug_options_count":4},{"id":46710,"question":"Vrai ou Faux ? La dérivée de la fonction f(x) = ln(x) est f'(x) = 1\/x.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"La dérivée de la fonction logarithme népérien est bien f'(x) = 1\/x pour x \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":46711,"question":"Quelle est la probabilité d'obtenir un double 6 en lançant deux dés équilibrés ?","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":"Il y a 6 × 6 = 36 issues possibles. Un seul cas favorable (6,6), donc la probabilité est 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":46712,"question":"Soit la fonction f(x) = x³ - 3x² + 2. Quel est le coefficient directeur de la tangente à la courbe au point d'abscisse x = 1 ?","option_a":"A. -3","option_b":"B. 0","option_c":"C. 3","option_d":"D. 1","option_e":"","option_f":"","bonne_reponse":"b","explication":"Le coefficient directeur de la tangente est f'(1). f'(x) = 3x² - 6x, donc f'(1) = 3(1)² - 6(1) = -3.","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. -3\", \"b\": \"B. 0\", \"c\": \"C. 3\", \"d\": \"D. 1\"}}","_debug_options_count":4},{"id":46713,"question":"Vrai ou Faux ? Toute suite croissante et majorée converge.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"C'est le théorème de convergence monotone : une suite croissante et majorée converge vers sa borne supérieure.","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":46714,"question":"Quelle est la solution de l'équation différentielle y' + 2y = 0 avec y(0) = 3 ?","option_a":"A. y = 3e^(2x)","option_b":"B. y = 3e^(-2x)","option_c":"C. y = -3e^(2x)","option_d":"D. y = 3e^(x\/2)","option_e":"","option_f":"","bonne_reponse":"b","explication":"L'équation différentielle est linéaire du premier ordre. La solution générale est y = Ce^(-2x). Avec y(0) = 3, on trouve C = 3, donc y = 3e^(-2x).","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. y = 3e^(2x)\", \"b\": \"B. y = 3e^(-2x)\", \"c\": \"C. y = -3e^(2x)\", ","_debug_options_count":4},{"id":46715,"question":"Soit A et B deux événements indépendants d'un même univers. Si P(A) = 0,3 et P(B) = 0,4, quelle est la probabilité de A ∩ B ?","option_a":"A. 0,12","option_b":"B. 0,7","option_c":"C. 0,07","option_d":"D. 0,1","option_e":"","option_f":"","bonne_reponse":"a","explication":"Pour des événements indépendants, P(A ∩ B) = P(A) × P(B) = 0,3 × 0,4 = 0,12.","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. 0,12\", \"b\": \"B. 0,7\", \"c\": \"C. 0,07\", \"d\": \"D. 0,1\"}}","_debug_options_count":4},{"id":46716,"question":"Vrai ou Faux ? La fonction f(x) = e^x est convexe sur ℝ.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"La dérivée seconde de f(x) = e^x est f''(x) = e^x \u003E 0 pour tout x ∈ ℝ, donc la fonction est convexe.","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":46717,"question":"Quelle est la valeur de l'intégrale ∫₀¹ (3x² + 2x) dx ?","option_a":"A. 1","option_b":"B. 2","option_c":"C. 3","option_d":"D. 4","option_e":"","option_f":"","bonne_reponse":"c","explication":"Calculons l'intégrale : ∫(3x² + 2x) dx = x³ + x² + C. Évaluée entre 0 et 1, on obtient (1 + 1) - (0 + 0) = 2.","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\", \"b\": \"B. 2\", \"c\": \"C. 3\", \"d\": \"D. 4\"}}","_debug_options_count":4}]