Quiz Mathématiques — Série d'exercices pour le collège

Question 1 sur 10 10:00

[{"id":25778,"question":"Quelle est la solution de l'équation 3x + 5 = 20 ?","option_a":"x = 5","option_b":"x = 15","option_c":"x = 25","option_d":"x = 10","option_e":"","option_f":"","bonne_reponse":"A","explication":"Pour résoudre 3x + 5 = 20, soustraire 5 des deux côtés donne 3x = 15, puis diviser par 3 donne x = 5.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":25779,"question":"Un angle de 90 degrés est appelé un angle aigu.","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, pas un angle aigu (qui mesure moins de 90°).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":25780,"question":"Quelle est la valeur de x dans l'équation 2(x - 3) = 4 ?","option_a":"x = 5","option_b":"x = 2","option_c":"x = 1","option_d":"x = 4","option_e":"","option_f":"","bonne_reponse":"A","explication":"Développer l'équation donne 2x - 6 = 4, puis ajouter 6 et diviser par 2 donne x = 5.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":25781,"question":"Le périmètre d'un carré de côté 4 cm est de 12 cm.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"B","explication":"Le périmètre d'un carré est 4 × côté, donc 4 × 4 = 16 cm, pas 12 cm.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":25782,"question":"Quelle est la fraction irréductible de 18\/24 ?","option_a":"3\/4","option_b":"2\/3","option_c":"6\/8","option_d":"9\/12","option_e":"","option_f":"","bonne_reponse":"A","explication":"Diviser le numérateur et le dénominateur par leur PGCD (6) donne 18\/24 = 3\/4.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":25783,"question":"Un triangle isocèle a toujours trois angles égaux.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"B","explication":"Un triangle isocèle a deux côtés égaux et deux angles égaux, mais pas forcément trois.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":25784,"question":"Calculer 75% de 80.","option_a":"60","option_b":"50","option_c":"40","option_d":"75","option_e":"","option_f":"","bonne_reponse":"A","explication":"75% de 80 = (75\/100) × 80 = 60.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":25785,"question":"La somme des angles d'un triangle est toujours égale à 180 degrés.","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 plane : la somme des angles d'un triangle est toujours 180°.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":25786,"question":"Résoudre l'inéquation 2x - 7 \u003E 5.","option_a":"x \u003E 6","option_b":"x \u003E 12","option_c":"x \u003C 6","option_d":"x \u003C 12","option_e":"","option_f":"","bonne_reponse":"A","explication":"Ajouter 7 des deux côtés donne 2x \u003E 12, puis diviser par 2 donne x \u003E 6.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":25787,"question":"Un parallélogramme a ses diagonales qui se coupent en leur milieu.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"C'est une propriété caractéristique des parallélogrammes : leurs diagonales se bisectent mutuellement.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0}]