N=5x-(x+2)²+5


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PDF 3ème Calcul littéral développement et factorisation

C = (x + 5)(x + 1) = x² + x + 5x + 5 = x² + 6x + 5 D = (2x – 5) (x + 4) = 2x² + 8x – 5x – 20 = 2x² + 3x – 20 E = (4 – a)² = 4² – 2 × 4 × a + a² = 16 – 8a + a²

PDF Exercice 1

F I x 16 x 100 64 16 x 5 C = (2x 1) x (2x + 1) 3 x 5 9 25 3 x 5 C = (2x)² - 12 F = x² + I 1 D - C = 4x2 (9x-8)² D (9x)² - 2 × 9x × 8+ 

PDF Exercices de 3ème – Chapitre 2 – Calcul littéral

Q = (x + 2)² – 6(3x – 5)² Exercice 5 a] (3x + )² = + + 49 b] (5x − )² = − + 36 c] (6x + )( − ) = − 64 d] ( + )² = 

PDF Polynômes

Effectuer la division euclidienne de A par B : (a) A = 3X5 +4X2 +1 B = X2 +2X +3 (b) A = 3X5 +2X4 −X2 +1 B = X3 +X +2 (c) A = X4 −X3 +X −2 B = X2 

PDF CAHIER DE MATHÉMATIQUES POUR LES ÉLÈVES RENTRANT

a/ 5(x + 2) = 5 × x + 5 × 2 = 5x + 10 b/ (2x – 3)(5x – 4) = 2x × 5x + 2x × (-4) – 3 × 5x – 3 × (-4) = 10x² – 8x – 15x + 12 = 10x² – 23x + 12 c/ (4x – 1)² 

PDF FACTORISATIONS

H = (8x + 4)(2x + 1)(1 + x) M = (2 + 2)(3 – 4x) D = 2(1 + x) I = (x + 15)2 N = x(x – 2) E = 3(5 + x)(32 + 5x) J = 4 – (x – 5)(3x – 5) O = (2x + 1)2(1 + x)

PDF ÉQUATIONS

Dans l'équation ci-dessus par exemple 2x et 5x sont juxtaposés par le lien faible « − » Par contre 2 et x sont juxtaposés par un lien fort « x » qui est 

  • Pourquoi 5 5 x 2 15 ?

    On constate qu'il y a dans notre problème une multiplication et une addition, d'après les priorités opérations nous devons commencer par la multiplication, soit 5×2 qui nous donne "10".
    Nous finirons donc par l'addition (puisque il nous reste que ça) soit 10+5 qui nous donne 15.
    La réponse à 5+5×2 est donc "15".

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Quelle est la solution de l'équation ?

Chacune des valeurs que l'on peut substituer aux variables d'une équation de manière à obtenir une égalité vraie.
. L'ensemble de toutes ces valeurs s'appelle l'ensemble solution de l'équation.

Quel sont les 3 identités remarquable ?

On peut distinguer 3 identités remarquables : La première égalité remarquable : (a+b)² = a² + 2ab + b² ; La deuxième égalité remarquable : (a-b)² = a² – 2ab + b² ; (a+b)²; La troisième égalité remarquable : (a+b) (a-b) = a² – b².

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n=c*v n=cxv n=e/hv n=n*na n=N/Na et n=m/M n=n/na unités n=v/vm na2o

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