Quiz Maths 7ème : Testez vos connaissances en algèbre et géométrie !

Question 1 sur 10 10:00

[{"id":9753,"question":"Quelle est la solution de l'équation 3x + 5 = 20 ?","option_a":"x = 5","option_b":"x = 15","option_c":"x = 45\/3","option_d":"x = 10","option_e":"","option_f":"","bonne_reponse":"A","explication":"Pour résoudre 3x + 5 = 20, on soustrait 5 des deux côtés (3x = 15), puis on divise par 3 (x = 5).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":9754,"question":"Le périmètre d'un carré de côté 4 cm est égal à 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, donc c'est vrai.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":9755,"question":"Quelle est la fraction irréductible de 18\/24 ?","option_a":"3\/4","option_b":"6\/8","option_c":"9\/12","option_d":"2\/3","option_e":"","option_f":"","bonne_reponse":"A","explication":"On simplifie 18\/24 en divisant numérateur et dénominateur par 6, ce qui donne 3\/4.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":9756,"question":"Si un rectangle a une longueur de 8 cm et une largeur de 3 cm, son aire est de :","option_a":"22 cm²","option_b":"24 cm²","option_c":"11 cm²","option_d":"48 cm²","option_e":"","option_f":"","bonne_reponse":"B","explication":"L'aire d'un rectangle se calcule par longueur × largeur. Ici, 8 × 3 = 24 cm².","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":9757,"question":"La somme de deux angles complémentaires est toujours égale à 90°.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Deux angles sont complémentaires si leur somme est 90°, donc c'est vrai.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":9758,"question":"Quelle est la valeur de x dans l'équation 2(x - 3) = 10 ?","option_a":"x = 8","option_b":"x = 5","option_c":"x = 6","option_d":"x = 7","option_e":"","option_f":"","bonne_reponse":"A","explication":"On développe d'abord : 2x - 6 = 10. Puis on ajoute 6 (2x = 16) et on divise par 2 (x = 8).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":9759,"question":"Un triangle rectangle a un côté de 6 cm et un autre de 8 cm. Quelle est la longueur de l'hypoténuse ?","option_a":"10 cm","option_b":"14 cm","option_c":"12 cm","option_d":"7 cm","option_e":"","option_f":"","bonne_reponse":"A","explication":"D'après le théorème de Pythagore, l'hypoténuse = √(6² + 8²) = √(36 + 64) = √100 = 10 cm.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":9760,"question":"Pour calculer 25% d'un nombre, on multiplie ce nombre par 0,25.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"25% correspond à 25\/100 = 0,25, donc multiplier par 0,25 donne bien 25% du nombre.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":9761,"question":"Quelle est la solution de l'inéquation 5x - 7 \u003C 18 ?","option_a":"x \u003C 5","option_b":"x \u003E 5","option_c":"x \u003C 25\/5","option_d":"x \u003E 25\/5","option_e":"","option_f":"","bonne_reponse":"A","explication":"On ajoute 7 (5x \u003C 25), puis on divise par 5 (x \u003C 5).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":9762,"question":"Un cercle a un rayon de 5 cm. Quelle est sa circonférence ?","option_a":"10π cm","option_b":"25π cm","option_c":"5π cm","option_d":"31,4 cm","option_e":"","option_f":"","bonne_reponse":"A","explication":"La circonférence d'un cercle se calcule par 2πr. Ici, 2 × π × 5 = 10π cm.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0}]