Mathématiques

Question

Calcul les produits suivants en simplifiant , puis donne les résultat sous une fraction iréductible.
a = -7/25 x -5/8
b= 18/-49 x 14/27
c : 45/28 x 7/-15
d = -2/6 x ( -21/11 )
e : 21/32 x 108 / 49
f = -26 x -5/39
g = 8/5 x -5/21 x ( -9/16 )

2 Réponse

  • a = -7/25 x -5/8
    a = 35/200
    a = 5 x 7 / 5 x 40
    a = 7/40

    b= 18/-49 x 14/27
    b = - 252/1323
    b = 63 x - 4 / 63 x 21
    b = - 4/21

    c = 45/28 x 7/-15
    c = - 315/420
    c = 105 x - 3 / 105 x 4
    c = - 3/4

    d = -2/6 x ( -21/11 )
    d = 42/66
    d = 6 x 7 / 6 x 11
    d = 7/11

    e = 21/32 x 108 / 49
    e = 2268/1568
    e = 28 x 81 / 28 x 56
    e = 81/56

    f = -26 x -5/39
    f = 130/39
    f = 13 x 10 / 13 x 3
    f = 10/3

    g = 8/5 x -5/21 x ( -9/16 )
    g = - 40/105 x - 9/16
    g = 360/1680
    g = 120 x 3 / 120 x 14
    g = 3/14
  • a = -7/25 x -5/8
    a = -7x-5/5x5x8
    a = 7/40

    b= 18/-49 x 14/27
    b = 2x9x2x7/-7x7x9x3
    b = -4/21

    c : 45/28 x 7/-15
    c = 3x3x5x7/4x7x-5x3
    c = -3/4

    d = -2/6 x ( -21/11 ) 
    d = 2x3x7/2x3x11
    d = 7/11

    e : 21/32 x 108 / 49
    e = 3x7x3x9x4/8x4x7x7
    e = 9x9/8x7
    e = 81/56

    f = -26 x -5/39
    f =2x13x5/3x13
    f = 10/3

    g = 8/5 x -5/21 x ( -9/16 )
    g = 8x5x3x3/5x3x7x8x2
    g = 3/14

Autres questions