Mathématiques

Question

Bonjour
Pouvez vous m aider SVP??
(+3)-5-(-3)-6+(-2)+8= (-3)+(-10)= (+6)-(+7)=
-6-28= 7-12= -12+5= (-11)-(-3)=
5/7-2/7= 3/8+13/24= 7/9x8/5= 12/77x35/30=
2/3-1/3x7/4= (27/40+1/5)x(4/7-4/21)=


Merci beaucoup...

1 Réponse

  • (+3) - 5 - (- 3) - 6 + (- 2) + 8
    = 3 - 5 + 3 - 6 - 2 + 8
    = 3 + 3 + 8 -5 - 6 - 2
    = 14 - 13
    = 1

    (- 3) + (- 10)  =  - 3 - 10 = - 13

    (+ 6) - (+ 7) = 6 - 7 = - 1

    -6 - 28  = - 34 

    7 - 12 = -  5

    - 12 + 5 = - 7

    (- 11) - (- 3)  = - 11 + 3 = - 8

    5/7 - 2/7 = 3/7

    3/8 + 13/24
    = 3 x 3 / 8 x 3 + 13/24
    = 9/24 + 13/24
    = 22/24
    = 2 x 11 / 2 x 12
    = 11/12

    7/9 x 8/5 = 56/45

    12/77 x 35/30
    = 420/2310
    = 210 x 2 / 210 x 11
    = 2/11

    2/3 - 1/3 x 7/4
    = 2/3 - 7/12
    = 2 x 4 / 3 x 4 - 7/12
    = 8/12 - 7/12
    = 1/12

    (27/40 + 1/5) x (4/7 - 4/21)
    =(27/40 + 1 x 8 / 5 x 8) x (4 x 3 / 7 x 3 - 4/21)
    = (27/40 - 8/40) x (12/21 - 4/21)
    = 19/40 x 8/21
    = 152/840
    = 8 x 19 / 8 x 105
    = 19/105

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