Quiz Mathématiques 7ème année : Arithmétique et Algèbre

Question 1 sur 10 10:00

[{"id":8673,"question":"Quel est le résultat de l'opération : 3\/4 + 1\/2 ?","option_a":"5\/4","option_b":"4\/6","option_c":"7\/8","option_d":"2\/3","option_e":"","option_f":"","bonne_reponse":"A","explication":"Pour additionner des fractions, il faut d'abord les mettre sous le même dénominateur. 3\/4 + 2\/4 = 5\/4.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":8674,"question":"Un nombre relatif négatif multiplié par un nombre relatif positif donne toujours un résultat négatif.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"La règle des signes indique qu'un nombre négatif × un nombre positif = négatif. Exemple : (-3) × 2 = -6.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":8675,"question":"Résoudre l'équation : 2x + 5 = 11","option_a":"x = 3","option_b":"x = 8","option_c":"x = 6","option_d":"x = 4","option_e":"","option_f":"","bonne_reponse":"A","explication":"Soustraire 5 des deux côtés : 2x = 6. Diviser par 2 : x = 3.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":8676,"question":"Le périmètre d'un carré de côté 5 cm est de :","option_a":"20 cm","option_b":"25 cm","option_c":"15 cm","option_d":"10 cm","option_e":"","option_f":"","bonne_reponse":"A","explication":"Le périmètre d'un carré = 4 × côté. Donc 4 × 5 = 20 cm.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":8677,"question":"Un nombre pair est toujours divisible par 2.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Par définition, un nombre pair est un multiple de 2, donc divisible par 2 sans reste.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":8678,"question":"Calculer : (-7) + (+3) = ?","option_a":"-10","option_b":"-4","option_c":"4","option_d":"10","option_e":"","option_f":"","bonne_reponse":"B","explication":"Ajouter un nombre positif à un nombre négatif revient à soustraire sa valeur absolue. -7 + 3 = -4.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":8679,"question":"La fraction 12\/18 simplifiée est égale à :","option_a":"2\/3","option_b":"4\/6","option_c":"6\/9","option_d":"3\/4","option_e":"","option_f":"","bonne_reponse":"A","explication":"Diviser le numérateur et le dénominateur par leur PGCD (6) : 12 ÷ 6 = 2, 18 ÷ 6 = 3.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":8680,"question":"Un triangle isocèle a toujours deux angles égaux.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Par définition, un triangle isocèle a deux côtés égaux et donc deux angles opposés à ces côtés égaux.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":8681,"question":"Résoudre : 5(x - 2) = 15","option_a":"x = 5","option_b":"x = 3","option_c":"x = 7","option_d":"x = 1","option_e":"","option_f":"","bonne_reponse":"A","explication":"Diviser par 5 : x - 2 = 3. Ajouter 2 : x = 5.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":8682,"question":"Le produit de deux nombres négatifs est toujours positif.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"La règle des signes : négatif × négatif = positif. Exemple : (-2) × (-3) = 6.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0}]