Quiz Mathématiques — 9ème année : Nombres, Équations et Géométrie

Question 1 sur 10 10:00

[{"id":18718,"question":"Quel est le résultat de l'opération suivante : (-3) + (-7) + 5 ?","option_a":"-15","option_b":"-5","option_c":"5","option_d":"15","option_e":"","option_f":"","bonne_reponse":"B","explication":"On additionne d'abord les nombres négatifs : (-3) + (-7) = -10. Puis on ajoute 5 : -10 + 5 = -5.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":18719,"question":"L'équation 2x - 5 = 9 a pour solution :","option_a":"x = 2","option_b":"x = 7","option_c":"x = -2","option_d":"x = 9","option_e":"","option_f":"","bonne_reponse":"B","explication":"On isole x : 2x = 9 + 5 → 2x = 14 → x = 7.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":18720,"question":"Vrai ou Faux ? Dans un triangle isocèle, les angles à la base sont égaux.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"C'est une propriété fondamentale des triangles isocèles : les angles adjacents à la base sont égaux.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":18721,"question":"Quel est le périmètre d'un rectangle de longueur 8 cm et de largeur 5 cm ?","option_a":"13 cm","option_b":"26 cm","option_c":"40 cm","option_d":"16 cm","option_e":"","option_f":"","bonne_reponse":"B","explication":"Le périmètre d'un rectangle se calcule par : 2 × (longueur + largeur) = 2 × (8 + 5) = 26 cm.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":18722,"question":"Vrai ou Faux ? 30% de 150 est égal à 45.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"30% de 150 = (30\/100) × 150 = 45. L'affirmation est donc vraie.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":18723,"question":"Résoudre l'équation : 3(x - 2) = 15.","option_a":"x = 3","option_b":"x = 5","option_c":"x = 7","option_d":"x = 9","option_e":"","option_f":"","bonne_reponse":"C","explication":"On développe : 3x - 6 = 15 → 3x = 21 → x = 7.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":18724,"question":"Quel est l'aire d'un triangle de base 6 cm et de hauteur 4 cm ?","option_a":"10 cm²","option_b":"12 cm²","option_c":"24 cm²","option_d":"48 cm²","option_e":"","option_f":"","bonne_reponse":"B","explication":"L'aire d'un triangle se calcule par : (base × hauteur) \/ 2 = (6 × 4) \/ 2 = 12 cm².","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":18725,"question":"Vrai ou Faux ? La somme des angles d'un quadrilatère est toujours égale à 360°.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"C'est une propriété géométrique : la somme des angles intérieurs d'un quadrilatère est toujours de 360°.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":18726,"question":"Quel est le résultat de l'opération : (-4) × (-2) × (-3) ?","option_a":"-24","option_b":"24","option_c":"-12","option_d":"12","option_e":"","option_f":"","bonne_reponse":"A","explication":"On multiplie les nombres : (-4) × (-2) = 8, puis 8 × (-3) = -24.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":18727,"question":"Si un article coûte 120 DT et bénéficie d'une réduction de 20%, quel est son nouveau prix ?","option_a":"24 DT","option_b":"96 DT","option_c":"100 DT","option_d":"144 DT","option_e":"","option_f":"","bonne_reponse":"B","explication":"La réduction est de 20% de 120 DT = 24 DT. Le nouveau prix est donc 120 - 24 = 96 DT.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0}]