Maths 3ème secondaire : Testez vos connaissances !

Question 1 sur 10 10:00

[{"id":33773,"question":"Quelle est la solution de l’équation 2x² - 5x + 2 = 0 ?","option_a":"x = 1 ou x = 2","option_b":"x = 0.5 ou x = 2","option_c":"x = -1 ou x = 2","option_d":"x = 1 ou x = -2","option_e":"","option_f":"","bonne_reponse":"B","explication":"Résolvez l’équation en utilisant le discriminant Δ = b² - 4ac = 25 - 16 = 9. Les solutions sont x = (5 ± 3)\/4, soit x = 2 ou x = 0.5.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":33774,"question":"La fonction f(x) = 3x + 2 est-elle une fonction affine ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Une fonction affine s’écrit sous la forme f(x) = ax + b, où a et b sont des réels. Ici, a = 3 et b = 2, donc c’est bien une fonction affine.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":33775,"question":"Quel est le coefficient directeur de la droite d’équation y = -4x + 7 ?","option_a":"-4","option_b":"7","option_c":"4","option_d":"-7","option_e":"","option_f":"","bonne_reponse":"A","explication":"Dans l’équation réduite y = mx + p, m représente le coefficient directeur. Ici, m = -4.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":33776,"question":"La moyenne d’une série de 5 notes : 12, 15, 10, 14, 19 est égale à :","option_a":"14","option_b":"13.8","option_c":"15","option_d":"12.5","option_e":"","option_f":"","bonne_reponse":"B","explication":"Calculez la somme des notes (12 + 15 + 10 + 14 + 19 = 70) puis divisez par le nombre de notes (70 \/ 5 = 14). La moyenne est donc 14.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":33777,"question":"L’identité remarquable (a + b)² = a² + 2ab + b² est-elle toujours vraie ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Cette identité est une propriété algébrique fondamentale et est toujours vraie pour tous réels a et b.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":33778,"question":"Résolvez l’inéquation 3x - 7 \u003E 2x + 1.","option_a":"x \u003E 8","option_b":"x \u003C 8","option_c":"x \u003E -8","option_d":"x \u003C -8","option_e":"","option_f":"","bonne_reponse":"A","explication":"Soustraisez 2x des deux côtés : x - 7 \u003E 1, puis ajoutez 7 : x \u003E 8.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":33779,"question":"Quelle est la probabilité d’obtenir un nombre pair en lançant un dé à 6 faces ?","option_a":"1\/6","option_b":"1\/2","option_c":"1\/3","option_d":"2\/3","option_e":"","option_f":"","bonne_reponse":"B","explication":"Il y a 3 nombres pairs (2, 4, 6) sur 6 faces possibles. La probabilité est donc 3\/6 = 1\/2.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":33780,"question":"La droite d’équation x = 5 est-elle parallèle à l’axe des ordonnées ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Une droite verticale (x = constante) est parallèle à l’axe des ordonnées (axe y).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":33781,"question":"Calculez (2x + 3)(x - 4) en développant.","option_a":"2x² - 5x - 12","option_b":"2x² + 5x - 12","option_c":"2x² - 11x - 12","option_d":"2x² + 11x - 12","option_e":"","option_f":"","bonne_reponse":"C","explication":"Développez en utilisant la distributivité : 2x * x + 2x * (-4) + 3 * x + 3 * (-4) = 2x² - 8x + 3x - 12 = 2x² - 5x - 12.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":33782,"question":"La fonction f(x) = x² est-elle croissante sur ℝ ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"B","explication":"La fonction f(x) = x² est décroissante sur ]-∞, 0] et croissante sur [0, +∞[. Elle n’est donc pas croissante sur tout ℝ.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0}]