Quiz : Maîtrisez les maths de 9ème année — Équations, géométrie et fractions

Question 1 sur 10 10:00

[{"id":69982,"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 = 7","option_e":"","option_f":"","bonne_reponse":"A","explication":"3x + 5 = 20 ⇒ 3x = 15 ⇒ x = 5. La solution est bien x = 5.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":69983,"question":"Le théorème de Pythagore s’applique uniquement aux triangles rectangles.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Le théorème de Pythagore ne s’applique qu’aux triangles rectangles.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":69984,"question":"Quelle est la valeur de 2³ × 2² ?","option_a":"2⁵","option_b":"2⁶","option_c":"4⁵","option_d":"4⁶","option_e":"","option_f":"","bonne_reponse":"A","explication":"2³ × 2² = 2^(3+2) = 2⁵. Les puissances de même base s’additionnent.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":69985,"question":"Si deux droites sont parallèles, alors leurs coefficients directeurs sont égaux.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Deux droites parallèles ont des coefficients directeurs identiques.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":69986,"question":"Résoudre l’équation : 4(x - 2) = 2x + 6.","option_a":"x = 7","option_b":"x = 5","option_c":"x = 3","option_d":"x = 4","option_e":"","option_f":"","bonne_reponse":"A","explication":"4(x - 2) = 2x + 6 ⇒ 4x - 8 = 2x + 6 ⇒ 2x = 14 ⇒ x = 7.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":69987,"question":"La fraction 3\/4 est équivalente à 0,75.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"3\/4 = 0,75. La division donne bien ce résultat.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":69988,"question":"Quel est le résultat de (-3)² ?","option_a":"9","option_b":"-9","option_c":"6","option_d":"-6","option_e":"","option_f":"","bonne_reponse":"A","explication":"(-3)² = (-3) × (-3) = 9. Un nombre négatif au carré devient positif.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":69989,"question":"Si AB = 5 cm et BC = 3 cm, alors AC peut mesurer 8 cm si A, B et C sont alignés.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Si A, B et C sont alignés, alors AC = AB + BC = 8 cm. L’affirmation est vraie.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":69990,"question":"Quelle est la solution de l’inéquation 2x - 7 \u003E 3 ?","option_a":"x \u003E 5","option_b":"x \u003C 5","option_c":"x \u003E 2","option_d":"x \u003C 2","option_e":"","option_f":"","bonne_reponse":"A","explication":"2x - 7 \u003E 3 ⇒ 2x \u003E 10 ⇒ x \u003E 5. La solution est x \u003E 5.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":69991,"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":"Périmètre = 4 × côté = 4 × 4 = 16 cm. L’affirmation est vraie.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0}]