Mathématiques

Question

j'ai besoin de vous pour un exercices de math je vous remercie d'avance

A= 7x-1
B= 7X(x-1)
C = (2x-1)X(3-x)
si x=-2 ; x=1/3 ; x=(2x-1)X(3-x)

1 Réponse

  • Si x = 2

    A = 7x - 1
    A = 7 * 2 - 1
    A = 14 - 1
    A = 13

    B= 7X(x-1)
    B = 7 * (2 - 1)
    B = 7 * 1
    B = 7

    C = (2x-1)X(3-x)
    C = (2 * 2 - 1) * (3 - 2)
    C = (4 - 1) * (2)
    C = 3 * 2
    C = 6

    Si x = 1/3

    A = 7x - 1
    A = 7 * 1/3 - 1
    A = 7/3 - 1
    A = 7/3 - 3/3
    A = 4/3

    B = 7 X (x - 1)
    B = 7 * (1/3 - 1)
    B= 7 * (1/3 - 3/3)
    B = 7 * - 2/3
    B = - 14/3

    C = (2x-1)X(3-x)
    C = (2 * 1/3 - 1) * (3 - 1/3)
    C = (2/3 - 1) * (9/3 - 1/3)
    C = (2/3 - 3/3) * (8/3)
    C = - 1/3 * 8/3
    C = - 8/9
     


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