Mathématiques

Question

bonjour urgent svp pour ce matin aidez moi svp. merci
bonjour urgent svp pour ce matin aidez moi svp. merci

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2 Réponse

  • A = 25/21 x 14/15

    A = 350/315

    A = 35 x 10 / 35 x 9

    A = 10/9


    B = 21/- 6 x - 9/56

    B = 189/336

    B = 21 x 9 / 21 x 16

    B = 9/16


    C = - 49/63 x - 9/- 28

    C = - 441/1764

    C = 441 x - 1 / 441 x 4

    C = - 1/4


    D = 18/15 x 75/- 16

    D = - 1350/240

    D = 30 x - 45 / 30 x 8

    D = - 45/8


  • Bonjour.

    A = (25/21) * (14/15)
    A = (25 * 14) / (21 * 15)
    A = (5 * 5 * 7 * 2) / (3 * 7 * 3 * 5)
    A = 10/9

    B = [21/(- 6)] * [(- 9)/56]
    B = (21 * 9) / (6 * 56)
    B = (7 * 3 * 3 * 3) / (3 * 2 * 8 * 7)
    B = 9/16

    C = (- 49/63) * [(- 9)/(- 28)]
    C = - (49 * 9) / (63 * 28)
    C = - (7 * 7 * 9) / (7 * 9 * 7 * 4)
    C = - 1/4

    D = (18/15) * [75/(- 16)]
    D = - (18 * 75) / (15 * 16)
    D = - ( 2 * 9 * 5 * 15) / (15 * 2 * 8)
    D = - 45/8

    Bonne journee !

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