Quiz : Les fondamentaux du baccalauréat en mathématiques

Question 1 sur 10 10:00

[{"id":11688,"question":"Quelle est la dérivée de la fonction f(x) = 3x² - 5x + 2 ?","option_a":"6x - 5","option_b":"3x - 5","option_c":"6x² - 5x","option_d":"3x² - 5","option_e":"","option_f":"","bonne_reponse":"A","explication":"La dérivée d'une fonction polynôme se calcule terme par terme : (3x²)' = 6x, (-5x)' = -5, et la dérivée de 2 est 0. Donc f'(x) = 6x - 5.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":11689,"question":"L'équation x² - 4x + 3 = 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 = 16 - 12 = 4 \u003E 0, donc l'équation admet deux solutions réelles distinctes.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":11690,"question":"Quelle est la limite de la fonction f(x) = (2x + 1)\/(x - 3) lorsque x tend vers +∞ ?","option_a":"2","option_b":"1","option_c":"0","option_d":"-2","option_e":"","option_f":"","bonne_reponse":"A","explication":"Pour x → +∞, on divise numérateur et dénominateur par x : f(x) = (2 + 1\/x)\/(1 - 3\/x) → 2\/1 = 2.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":11691,"question":"La fonction f(x) = x³ - 3x est croissante sur l'intervalle [-2, 0].","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"B","explication":"La dérivée f'(x) = 3x² - 3. Sur [-2, 0], f'(x) ≤ 0 (ex : f'(-1) = 0), donc la fonction est décroissante.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":11692,"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":"2x - 5 \u003E 3x + 1 → -5 - 1 \u003E 3x - 2x → -6 \u003E x → x \u003C -6.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":11693,"question":"La fonction f(x) = √(x + 4) est définie pour tout x réel.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"B","explication":"La fonction √(x + 4) est définie uniquement si x + 4 ≥ 0, donc pour x ≥ -4.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":11694,"question":"Quelle est l'équation de la tangente à la courbe de f(x) = x² au point d'abscisse x = 1 ?","option_a":"y = 2x + 1","option_b":"y = 2x - 1","option_c":"y = x + 1","option_d":"y = x - 1","option_e":"","option_f":"","bonne_reponse":"B","explication":"La tangente a pour équation y = f'(a)(x - a) + f(a). Ici, f'(1) = 2 et f(1) = 1, donc y = 2(x - 1) + 1 = 2x - 1.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":11695,"question":"La probabilité d'obtenir un nombre pair en lançant un dé équilibré est de 1\/2.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Un dé a 6 faces (1, 2, 3, 4, 5, 6). Les nombres pairs sont 2, 4, 6 → 3 cas favorables sur 6 possibles, donc P = 3\/6 = 1\/2.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":11696,"question":"Quelle est la valeur de l'intégrale ∫(3x² + 2x) dx entre 0 et 1 ?","option_a":"1","option_b":"2","option_c":"3","option_d":"4","option_e":"","option_f":"","bonne_reponse":"B","explication":"∫(3x² + 2x) dx = x³ + x². Entre 0 et 1 : (1 + 1) - (0 + 0) = 2.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":11697,"question":"La fonction f(x) = 1\/x est décroissante sur son ensemble de définition.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"La dérivée f'(x) = -1\/x² \u003C 0 pour tout x ≠ 0, donc la fonction est décroissante sur chaque intervalle de son ensemble de définition.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0}]