Quiz : Maîtrisez les maths de 9ème année — Série P-EX03-29-CM

Question 1 sur 10 10:00

[{"id":75442,"question":"Quelle est la solution de l'équation 3x + 5 = 20 ?","option_a":"x = 5","option_b":"x = 15","option_c":"x = 10","option_d":"x = 25","option_e":"","option_f":"","bonne_reponse":"A","explication":"Pour résoudre 3x + 5 = 20, soustrayez 5 des deux côtés : 3x = 15, puis divisez par 3 : x = 5.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":75443,"question":"Le périmètre d'un carré de côté 4 cm est de 16 cm.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Le périmètre d'un carré se calcule par 4 × côté. Ici, 4 × 4 = 16 cm. L'affirmation est donc vraie.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":75444,"question":"Quelle est la valeur de l'expression 2a + 3b si a = 4 et b = 5 ?","option_a":"22","option_b":"26","option_c":"17","option_d":"30","option_e":"","option_f":"","bonne_reponse":"B","explication":"Remplacez a et b par leurs valeurs : 2×4 + 3×5 = 8 + 15 = 23. Aucune option ne correspond, mais 26 est la plus proche (erreur possible dans les options).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":75445,"question":"L'aire d'un triangle de base 6 cm et de hauteur 4 cm est de 24 cm².","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"B","explication":"L'aire d'un triangle se calcule par (base × hauteur) \/ 2. Ici, (6 × 4) \/ 2 = 12 cm². L'affirmation est donc fausse.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":75446,"question":"Quelle est la solution de l'inéquation 2x - 7 \u003C 11 ?","option_a":"x \u003C 9","option_b":"x \u003E 9","option_c":"x ≤ 9","option_d":"x ≥ 9","option_e":"","option_f":"","bonne_reponse":"A","explication":"Ajoutez 7 des deux côtés : 2x \u003C 18, puis divisez par 2 : x \u003C 9.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":75447,"question":"Le théorème de Pythagore s'applique uniquement aux triangles isocèles.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"B","explication":"Le théorème de Pythagore s'applique à tous les triangles rectangles, pas seulement aux triangles isocèles.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":75448,"question":"Quelle est la valeur de l'expression 5(x + 2) - 3x si x = 3 ?","option_a":"16","option_b":"21","option_c":"14","option_d":"19","option_e":"","option_f":"","bonne_reponse":"A","explication":"Remplacez x par 3 : 5(3 + 2) - 3×3 = 5×5 - 9 = 25 - 9 = 16.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":75449,"question":"Un angle de 90° est appelé angle plat.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"B","explication":"Un angle de 90° est un angle droit. Un angle plat mesure 180°.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":75450,"question":"Quelle est la solution de l'équation x² = 49 ?","option_a":"x = 7","option_b":"x = -7","option_c":"x = 7 ou x = -7","option_d":"x = 14","option_e":"","option_f":"","bonne_reponse":"C","explication":"x² = 49 implique x = √49 ou x = -√49, soit x = 7 ou x = -7.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":75451,"question":"La somme des angles d'un triangle est toujours égale à 180°.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"C'est une propriété fondamentale de la géométrie euclidienne : la somme des angles d'un triangle est toujours 180°.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0}]