Quiz — serie n6 exelllent.pdf

Question 1 sur 10 20:00

[{"id":15769,"question":"Quelle est la solution de l'équation x² - 5x + 6 = 0 ?","option_a":"x = 2 ou x = 3","option_b":"x = -2 ou x = -3","option_c":"x = 1 ou x = 6","option_d":"x = 0 ou x = 5","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'équation x² - 5x + 6 = 0 se factorise en (x-2)(x-3) = 0, donc les solutions sont x = 2 et x = 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\": \"x = 2 ou x = 3\", \"b\": \"x = -2 ou x = -3\", \"c\": \"x = 1 ou x = 6\", ","_debug_options_count":4},{"id":15770,"question":"La dérivée de la fonction f(x) = 3x² + 2x - 1 est f'(x) = 6x + 2.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"La dérivée de 3x² est 6x, celle de 2x est 2, et celle de -1 est 0. Donc f'(x) = 6x + 2 est correct.","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":15771,"question":"Quel est le résultat de ∫(2x + 3) dx ?","option_a":"x² + 3x + C","option_b":"x² + 3x","option_c":"2x² + 3x + C","option_d":"2x² + 3","option_e":"","option_f":"","bonne_reponse":"c","explication":"L'intégrale de 2x est x² et celle de 3 est 3x, donc ∫(2x + 3) dx = x² + 3x + C.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"x² + 3x + C\", \"b\": \"x² + 3x\", \"c\": \"2x² + 3x + C\", \"d\": \"2x² ","_debug_options_count":4},{"id":15772,"question":"Dans un triangle rectangle, si cos(θ) = 3\/5, quelle est la valeur de sin(θ) ?","option_a":"4\/5","option_b":"3\/4","option_c":"5\/3","option_d":"1\/5","option_e":"","option_f":"","bonne_reponse":"a","explication":"Dans un triangle rectangle, sin²(θ) + cos²(θ) = 1, donc sin(θ) = √(1 - (3\/5)²) = √(16\/25) = 4\/5.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"4\/5\", \"b\": \"3\/4\", \"c\": \"5\/3\", \"d\": \"1\/5\"}}","_debug_options_count":4},{"id":15773,"question":"La fonction f(x) = x³ - 3x est croissante sur l'intervalle ]-∞, -1[.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"La dérivée f'(x) = 3x² - 3 est négative sur ]-∞, -1[ (car 3x² - 3 \u003C 0 pour x \u003C -1), donc la fonction est décroissante sur cet intervalle.","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":15774,"question":"Quel est le développement de (x + 2)³ ?","option_a":"x³ + 6x² + 12x + 8","option_b":"x³ + 3x² + 3x + 8","option_c":"x³ + 6x² + 8","option_d":"x³ + 2x² + 4x + 8","option_e":"","option_f":"","bonne_reponse":"a","explication":"En utilisant la formule (a + b)³ = a³ + 3a²b + 3ab² + b³, on obtient (x + 2)³ = x³ + 6x² + 12x + 8.","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 + 6x² + 12x + 8\", \"b\": \"x³ + 3x² + 3x + 8\", \"c\": \"x³ + 6x","_debug_options_count":4},{"id":15775,"question":"Si A = (1, 2) et B = (4, 6), quelle est la norme du vecteur AB ?","option_a":"5","option_b":"√(13)","option_c":"√(25)","option_d":"√(10)","option_e":"","option_f":"","bonne_reponse":"c","explication":"Le vecteur AB = (4-1, 6-2) = (3, 4). Sa norme est √(3² + 4²) = √(9 + 16) = √25 = 5.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"5\", \"b\": \"√(13)\", \"c\": \"√(25)\", \"d\": \"√(10)\"}}","_debug_options_count":4},{"id":15776,"question":"La fonction f(x) = 1\/x est dérivable en x = 0.","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 dérivable en ce point.","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":15777,"question":"Quelle est la solution de l'inéquation 2x - 5 \u003E 3x + 1 ?","option_a":"x \u003C -6","option_b":"x \u003E -6","option_c":"x \u003C 6","option_d":"x \u003E 6","option_e":"","option_f":"","bonne_reponse":"a","explication":"En résolvant 2x - 5 \u003E 3x + 1, on obtient -x \u003E 6, donc x \u003C -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\": \"x \u003C -6\", \"b\": \"x \u003E -6\", \"c\": \"x \u003C 6\", \"d\": \"x \u003E 6\"}}","_debug_options_count":4},{"id":15778,"question":"Quel est le résultat de lim(x→0) (sin(x)\/x) ?","option_a":"0","option_b":"1","option_c":"∞","option_d":"non défini","option_e":"","option_f":"","bonne_reponse":"b","explication":"La limite lim(x→0) (sin(x)\/x) est une limite fondamentale en analyse et vaut 1.","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\": \"∞\", \"d\": \"non défini\"}}","_debug_options_count":4}]