Maths BAC : Testez vos connaissances en 10 questions !

Question 1 sur 10 10:00

[{"id":30108,"question":"Quelle est la dérivée de la fonction f(x) = 3x² + 2x - 5 ?","option_a":"6x + 2","option_b":"3x + 2","option_c":"6x² + 2x","option_d":"3x² + 2","option_e":"","option_f":"","bonne_reponse":"A","explication":"La dérivée d'une fonction polynôme se calcule en appliquant la règle : (ax^n)' = n*ax^(n-1). Ici, f'(x) = 6x + 2.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":30109,"question":"L'équation x² - 5x + 6 = 0 admet-elle deux solutions réelles distinctes ?","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 : x=2 et x=3.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":30110,"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":"∞","option_e":"","option_f":"","bonne_reponse":"A","explication":"Pour x → +∞, on divise numérateur et dénominateur par x : f(x) ≈ 2x\/x = 2. La limite est donc 2.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":30111,"question":"La suite définie par uₙ = 2n + 1 est-elle arithmétique ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Une suite est arithmétique si uₙ₊₁ - uₙ est constant. Ici, uₙ₊₁ - uₙ = 2(n+1) + 1 - (2n + 1) = 2, donc elle est arithmétique de raison 2.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":30112,"question":"Quelle est la probabilité d'obtenir un nombre pair en lançant un dé équilibré à 6 faces ?","option_a":"1\/3","option_b":"1\/2","option_c":"1\/6","option_d":"2\/3","option_e":"","option_f":"","bonne_reponse":"B","explication":"Il y a 3 nombres pairs (2, 4, 6) sur 6 faces possibles. La probabilité est donc 3\/6 = 1\/2.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":30113,"question":"La fonction f(x) = x³ - 3x est-elle 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 - 3 s'annule en x = ±1. La fonction est décroissante sur [-1, 1], donc elle n'est pas croissante sur ℝ.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":30114,"question":"Quelle est la solution de l'inéquation 2x - 7 ≤ 3x + 1 ?","option_a":"x ≥ -8","option_b":"x ≤ -8","option_c":"x ≥ 8","option_d":"x ≤ 8","option_e":"","option_f":"","bonne_reponse":"A","explication":"En résolvant : 2x - 7 ≤ 3x + 1 → -x ≤ 8 → x ≥ -8.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":30115,"question":"La suite géométrique de premier terme u₀ = 2 et de raison q = 3 est-elle convergente ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"B","explication":"Une suite géométrique de raison |q| \u003E 1 diverge vers ±∞. Ici, q = 3 \u003E 1, donc la suite diverge.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":30116,"question":"Quelle est l'intégrale de f(x) = 4x³ entre 0 et 2 ?","option_a":"8","option_b":"16","option_c":"32","option_d":"64","option_e":"","option_f":"","bonne_reponse":"B","explication":"L'intégrale de 4x³ est x⁴. Évaluée entre 0 et 2 : 2⁴ - 0⁴ = 16.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":30117,"question":"Le nombre complexe z = 3 + 4i a-t-il un module égal à 5 ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Le module de z est √(3² + 4²) = √(9 + 16) = √25 = 5.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0}]