Mathématiques

Question

calculer et donner le résultats sous forme de fraction

a)13/8-3/2*1/3
b)2/9+7/9*11/2
c)8-5*3/7
d)11/12*4-4*2/3
e)2/3+4/3*6
f)7/8+24*5/16
merci si quelqu'un. peut m'aider

2 Réponse

  • a)13/8-3/2*1/3 =2
    b)2/9+7/9*11/2 =3
    c)8-5*3/7=6
    d)11/12*4-4*2/3=8
    e)2/3+4/3*6=10
    f)7/8+24*5/16=78

  • a)13/8-3/2*1/3
    = 13/8 - 3/6
    = 13 x 3 / 8 x 3 - 3 x 4 / 6 x 4
    = 39/24 - 12/2
    = 27/24
    = 3 x 9 / 3 x 8
    = 9/8

    b)2/9+7/9*11/2
    = 2/9 - 77/18
    = 2 x 2 / 9 x 2 - 77/18
    = 4/18 - 77/18
    = - 73/18

    c)8-5*3/7
    = 8 - 15/7
    = 8 x 7 / 1 x 7 - 15/7
    = 56/7 - 15/7
    = 41/7

    d)11/12*4-4*2/3
    = 44/12 - 8/3
    = 44/12 - 8 x 4 / 3 x 4
    = 44/12 - 32/12
    = 12/12
    = 12 x 1 / 12 x 1
    = 1/1
    = 1

    e)2/3+4/3*6
    = 2/3 + 24/3
    = 26/3

    f)7/8+24*5/16

    = 7/8 + 120/16
    = 7 x 2 / 8 x 2 + 120/16
    = 14/16 + 120/16
    = 134/16
    = 2 x 67 / 2 x 8
    = 67/8

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