Maths Terminale Sciences : Testez vos connaissances en analyse, algèbre et géométrie

Question 1 sur 10 10:00

[{"id":42076,"question":"Quelle est la dérivée de la fonction f(x) = x³ - 2x² + 5x - 1 ?","option_a":"A. 3x² - 4x + 5","option_b":"B. 3x² - 4x + 1","option_c":"C. x³ - 4x + 5","option_d":"D. 3x² - 2x + 5","option_e":"","option_f":"","bonne_reponse":"A","explication":"La dérivée d'une fonction polynôme s'obtient en appliquant la formule (x^n)' = n*x^(n-1) à chaque terme. Ainsi, f'(x) = 3x² - 4x + 5.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":42077,"question":"L'intégrale ∫(2x + 3) dx est égale à :","option_a":"A. x² + 3x + C","option_b":"B. x² + 3x","option_c":"C. 2x² + 3x + C","option_d":"D. x² + 6x + C","option_e":"","option_f":"","bonne_reponse":"A","explication":"L'intégrale d'une fonction linéaire s'obtient en utilisant la formule ∫(ax + b) dx = (a\/2)x² + bx + C. Ici, a=2 et b=3, donc ∫(2x + 3) dx = x² + 3x + C.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":42078,"question":"La fonction f(x) = e^(2x) est toujours positive sur ℝ.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"La fonction exponentielle e^x est toujours positive pour tout x réel. Comme 2x ∈ ℝ, e^(2x) \u003E 0 pour tout x ∈ ℝ.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":42079,"question":"Résolvez l'équation : 2x² - 5x + 2 = 0.","option_a":"A. x = 1 ou x = 2","option_b":"B. x = 2 ou x = 1\/2","option_c":"C. x = -1 ou x = -2","option_d":"D. x = 1\/2 ou x = 2","option_e":"","option_f":"","bonne_reponse":"B","explication":"En utilisant la formule des racines d'un polynôme du second degré ax² + bx + c = 0, on obtient Δ = 25 - 16 = 9. Les solutions sont x = (5 ± 3)\/4, soit x = 2 ou x = 1\/2.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":42080,"question":"L'équation ln(x) = 0 admet pour solution :","option_a":"A. x = 0","option_b":"B. x = 1","option_c":"C. x = e","option_d":"D. x = -1","option_e":"","option_f":"","bonne_reponse":"B","explication":"La fonction logarithme népérien ln(x) est définie pour x \u003E 0. ln(x) = 0 ⇨ x = e^0 ⇨ x = 1.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":42081,"question":"Soit f une fonction dérivable sur ℝ telle que f'(x) \u003E 0 pour tout x ∈ ℝ. Alors f est strictement croissante sur ℝ.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Si f est dérivable et f'(x) \u003E 0 pour tout x ∈ ℝ, alors f est strictement croissante sur ℝ (théorème des accroissements finis).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":42082,"question":"Calculez la limite : lim (x→+∞) (3x² + 2x - 1)\/(x² + 5).","option_a":"A. 0","option_b":"B. 3","option_c":"C. +∞","option_d":"D. -∞","option_e":"","option_f":"","bonne_reponse":"B","explication":"Pour calculer cette limite, on divise le numérateur et le dénominateur par x² (terme dominant). On obtient lim (x→+∞) (3 + 2\/x - 1\/x²)\/(1 + 5\/x²) = 3\/1 = 3.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":42083,"question":"Soit ABC un triangle rectangle en A. Si AB = 3 et AC = 4, alors BC mesure :","option_a":"A. 5","option_b":"B. 7","option_c":"C. √7","option_d":"D. 12","option_e":"","option_f":"","bonne_reponse":"A","explication":"D'après le théorème de Pythagore, BC² = AB² + AC² = 9 + 16 = 25. Donc BC = √25 = 5.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":42084,"question":"L'équation cos(x) = 1\/2 admet pour solutions dans [0; 2π] :","option_a":"A. x = π\/3 et x = 5π\/3","option_b":"B. x = π\/6 et x = 11π\/6","option_c":"C. x = π\/3 et x = 2π\/3","option_d":"D. x = π\/6 et x = 5π\/6","option_e":"","option_f":"","bonne_reponse":"B","explication":"Les solutions de cos(x) = 1\/2 dans [0; 2π] sont x = π\/3 et x = 5π\/3 (ou x = -π\/3 + 2π).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":42085,"question":"Soit f une fonction continue sur [a; b]. Alors f admet un maximum et un minimum sur cet intervalle.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"C'est le théorème des bornes atteintes : toute fonction continue sur un segment [a; b] est bornée et atteint ses bornes (maximum et minimum).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0}]