Quiz — Exsam December 2009.doc

Question 1 sur 10 20:00

[{"id":4686,"question":"Quelle est la forme générale d'une fonction affine ?","option_a":"f(x) = ax + b","option_b":"f(x) = ax² + bx + c","option_c":"f(x) = a^x","option_d":"f(x) = log(x)","option_e":"","option_f":"","bonne_reponse":"a","explication":"Une fonction affine s'écrit sous la forme f(x) = ax + b, où a et b sont des constantes réelles.","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) = ax + b\", \"b\": \"f(x) = ax² + bx + c\", \"c\": \"f(x) = a^x\", \"","_debug_options_count":4},{"id":4687,"question":"L'équation x² - 5x + 6 = 0 admet deux solutions réelles.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Le discriminant Δ = b² - 4ac = 25 - 24 = 1 \u003E 0, donc l'équation admet deux solutions réelles distinctes.","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":4688,"question":"Quelle est la solution de l'inéquation 3x - 7 \u003E 2x + 1 ?","option_a":"x \u003E 8","option_b":"x \u003C 8","option_c":"x \u003E 6","option_d":"x \u003C 6","option_e":"","option_f":"","bonne_reponse":"c","explication":"En simplifiant, on obtient x \u003E 8, donc la solution est x \u003E 8.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"x \u003E 8\", \"b\": \"x \u003C 8\", \"c\": \"x \u003E 6\", \"d\": \"x \u003C 6\"}}","_debug_options_count":4},{"id":4689,"question":"La moyenne d'une série statistique est toujours égale à la médiane.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"La moyenne et la médiane sont égales uniquement si la distribution est symétrique. Sinon, elles peuvent être différentes.","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":4690,"question":"Quelle est l'image de 2 par la fonction f(x) = 3x² - 2x + 1 ?","option_a":"7","option_b":"9","option_c":"11","option_d":"13","option_e":"","option_f":"","bonne_reponse":"c","explication":"En remplaçant x par 2, on obtient f(2) = 3*(2)² - 2*2 + 1 = 12 - 4 + 1 = 9.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"7\", \"b\": \"9\", \"c\": \"11\", \"d\": \"13\"}}","_debug_options_count":4},{"id":4691,"question":"Le discriminant d'une équation du second degré ax² + bx + c = 0 est donné par Δ = b² - 4ac.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"La formule du discriminant est bien Δ = b² - 4ac, utilisée pour déterminer le nombre de solutions réelles.","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":4692,"question":"Quelle est la solution de l'équation |x - 3| = 5 ?","option_a":"x = 8 ou x = -2","option_b":"x = 8 ou x = 2","option_c":"x = -8 ou x = 2","option_d":"x = -8 ou x = -2","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'équation |x - 3| = 5 donne deux solutions : x - 3 = 5 ⇒ x = 8 et x - 3 = -5 ⇒ x = -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\": \"x = 8 ou x = -2\", \"b\": \"x = 8 ou x = 2\", \"c\": \"x = -8 ou x = 2\", ","_debug_options_count":4},{"id":4693,"question":"La médiane d'une série de 5 nombres est toujours le troisième nombre.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Pour une série de 5 nombres ordonnés, la médiane est bien le troisième nombre.","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":4694,"question":"Quelle est la dérivée de la fonction f(x) = 4x³ - 2x² + 5x - 1 ?","option_a":"f'(x) = 12x² - 4x + 5","option_b":"f'(x) = 12x² - 4x - 1","option_c":"f'(x) = 4x² - 2x + 5","option_d":"f'(x) = 12x² - 2x + 5","option_e":"","option_f":"","bonne_reponse":"a","explication":"La dérivée de f(x) = 4x³ - 2x² + 5x - 1 est f'(x) = 12x² - 4x + 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\": \"f'(x) = 12x² - 4x + 5\", \"b\": \"f'(x) = 12x² - 4x - 1\", \"c\": \"f'(","_debug_options_count":4},{"id":4695,"question":"Le coefficient de corrélation linéaire r entre deux variables est toujours compris entre -1 et 1.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Le coefficient de corrélation linéaire r mesure l'intensité et le sens de la relation linéaire entre deux variables, et il est toujours compris entre -1 et 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}]