Mathématiques

Question

Salut pourriez-vous m'aider pour 3 calculs SVP :

- Q= -14/30 + 10/30 ÷ 8/28
- P= (-12/14 + 20/15) x 98/25
- R= 25/18 - 7/9 x (-5/14 + 8/21)

1 Réponse

  • Q= -14/30 + 10/30 ÷ 8/28
    Q = - 14/30 + 10/30 x 28/8
    A = - 14/30 + 280/240
    A = - 14 x 8 / 30 x 8 + 280/40
    A = - 112/240  + 280/240
    A = 168/240
    A = 24 x 7 / 24 x 10
    A = 7/10

    P= (-12/14 + 20/15) x 98/25
    P = (- 12 x 15 / 14 x 15 + 20 x 14 / 15 x 14) x 98/25
    P = (- 180/210 + 280/210) x 98/25
    P = 100/210 x 98/25
    P = 9800/5250
    P = 350 x 28 / 350 x 15
    P = 28/15

    R= 25/18 - 7/9 x (-5/14 + 8/21)
    R = 25/18  - 7/9 x (- 5 x 3 / 14 x 3 + 8 x 2 / 21 x 2)
    R = 25/18 - 7/9 x (- 15/42 + 16/42)
    R = 25/18 - 7/9 x (1/42)
    R = 25/18 - 7/378
    R = 25 x 21 / 18 x 21 - 7/378
    R = 525/378 - 7/378
    R = 518/378
    R = 14 x 37 / 14 x 27
    R = 37/27

Autres questions