Mathématiques

Question

43 a. 7x – 6= 4 - 3x b. 12 - a= 18 - 3a
b. 13x + 11 = 8x + 28
44 a. -t - 4= 8 + 7t
15 a. 5x = 0
b. 7y + 22 = 14 – 4y​

1 Réponse

  • il faut passer les x ou t ou a ou y  d'un coté et les nombres de l'autre

    a = 7x - 6 = 4 - 3x

    a = -7x + 3x = 4 + 6

    a = -4x = 10

    a = x = -4/10 = -2 /5

    b = 12 - a = 18 - 3a

    b = 12-18 = a - 3a

    b = -6 = -2a

    b = -2a/-6 = a =  1/3

    13x + 11 = 8 x + 28

    13 x - 8 x = 28 - 11

    21 x = 17

    x = 17/21

    - t - 4 = 8 + 7 t

    -t -7t =8 + 4

    -8 t = 12

    t =  - 12/8 = -3/2

    5x = 0  x = 0

    7y + 22 = 14 - 4 y

    7 y +4 y = 14 - 22

    11 y = - 8

    y = -8/11

Autres questions