Mathématiques

Question

calculer et simplifiez

A= -1/2 x 5/-7 x 14/15=

B= 5 x (-6/5+1/10=

C= 5/3 - 4/7 ÷ 5/14 =

2 Réponse

  • A = - 1/2 x 5/-7 x 14/15
    A = 5/14 x 14/15
    A = 70/210
    A = 70 x 1 / 70 x 3
    A = 1/3

    B = 5 x (-6/5 + 1/10)
    B = 5 x (- 6 x 2 / 5 x 2 + 1/10)
    B = 5 x (- 12/10 + 1/10)
    B = 5 x - 1/10
    B = - 5/10
    B = 5 x - 1 / 5 x 2
    B = - 1/2

    C = 5/3 - 4/7 ÷ 5/14
    C = 5/3 - 4/7 x 14/5
    C = 5/3 - 56/35
    C = 5 x 35 / 3 x 35 - 56 x 3 / 35 x 3
    C = 175/105 - 168/105
    C = - 7/105
    C = 7 x -1 / 7 x 15
    C = - 1/15
  • A=1/2X5/-7X14/15=1X5X14/2X(-7X15

    =1X5X2X7/1X2X7X(-1X3X5=1/-3
    A=-1/3

Autres questions