Mathématiques

Question

Merci de m'aider svp​
Merci de m'aider svp​

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2 Réponse

  • Bonjour

    A = 8/5 + 2/5 x 1/2

    A = 8/5 + 2/10

    A = (8 x 2) / (5 x 2) + 2/10

    A = 16/10 + 2/10

    A = 18/10

    A = (2 x 9) / (2 x 5)

    A = 9/5

    B = 1/2 - 6/10 x 3/2 - 1/7

    B = 1/2 - 18/20 - 1/7

    B = (1 x 70) / (2 x 70) - (18 x 7) / (20 x 7) - (1 x 20) / (7 x 20)

    B = 70/140 - 126/140 - 20/140

    B = - 76/140

    B = (4 x - 19) / (4 x 35)

    B = - 19/35.

    C = 3/5 x 2/5 + 7/10

    C = 6/25 + 7/10

    C = (6 x 2) / (25 x 2) + (7 x 5) / (10 x 5)

    C = 12/50 + 35/50

    C = 47/50

    D = 4/25 - (12/30 + 1/5)

    D = 4/25 - [12/30 + (1 x 6) / (5 x 6)]

    D = 4/25 - (12/30 + 6/30)

    D = 4/25 - 18/30

    D = (4 x 6) / (25 x 6) - (18 x 5) / (30 x 5)

    D = 24/150 - 90/150

    D = - 66/150

    D = (6 x - 11) / (6 x 25)

    D = - 11/25.

  • Réponse :

    Explications étape par étape

    Bonjour

    Calculer

    A = 8/5 + 2/5 x 1/2

    A = 8/5 + 2/2 x 1/5

    A = 8/5 + 1/5

    [tex]\bf{A = 9/5}[/tex]

    B = 3/5 x 2/5 + 7/10

    B = 6/25 + (7 x 5)/(10 x 5)

    B = (6 x 2)/(25 x 2) + 35/50

    B = 12/50 + 35/50

    [tex]\bf{B = 47/50}[/tex]

    C = 1/2 - 6/10 x 3/2 - 1/7

    C = 1/2 - (2 x 3)/(2 x 5) x 3/2 - 1/7

    C = 1/2 - 3/5 x 3/2 - 1/7

    C = 1/2 - 9/10 - 1/7

    C = (1 x 35)/(2 x 35) - (9 x 7)/(10 x 7) - (1 x 10)/(7 x 10)

    C = 35/70 - 63/70 - 10/70

    C = 35/70 - 73/70

    C = 38/70

    C = (2 x 19)/(2 x 35)

    C = 19/35

    D = 4/25 - (12/30 + 1/5)

    D = 4/25 - (6 x 2)/(6 x 5) - 1/5

    D = 4/25 - 2/5 - (1 x 5)/(5 x 5)

    D = 4/25 - 10/25 - 5/25

    D = 4/25 - 15/25

    D = -11/25

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