Mathématiques

Question

Effectuer les opérations suivantes. Donnez les étapes du calcul.
A = (+15) + (-25) A = (+15) - (-25)

B = (-7) + (-7) B = (-7) - (-7)

C = (+9) + (+3) C = (+9) - (+3)

D = (-12) + (+20) D = (-12) - (+20)

E = (-10) + (+10) E = (-10) - (+10)

Calculer les expressions suivantes en regroupant astucieusement.
M = (-2) + (+3,25) - (+1,25) - (-2) P = (-5,5) + (+12) - (+3,5) + (-10)

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2 Réponse

  • Bonjour LelaMusic

    A = (+15) + (-25)
    A = 15 - 25
    A = -10 

    A = (+15) - (-25)
    A = 15 + 25
    A = 40

    B = (-7) + (-7)
    B = -7 - 7
    B = -14 

    B = (-7) - (-7)
    B = -7 + 7
    B = 0

    C = (+9) + (+3)
    C = 9 + 3
    C = 12 

    C = (+9) - (+3)
    C = 9 - 3
    C = 6

    D = (-12) + (+20)
    D = -12 + 20
    D = 20 - 12
    D = 8 

    D = (-12) - (+20)
    D = -12 - 20
    D = -32

    E = (-10) + (+10)
    E = -10 + 10
    E = 0

    E = (-10) - (+10)
    E = -10 - 10
    E = -20

    Calculer les expressions suivantes en regroupant astucieusement.
    M = (-2) + (+3,25) - (+1,25) - (-2)

    M = ((-2) - (-2)) + ((+3,25) - (+1,25))
    M = (-2 + 2) + (3,25 - 1,25)
    M = 0 + 2
    M = 2

    P = (-5,5) + (+12) - (+3,5) + (-10)

    P = ((-5,5) - (+3,5)) + ((+12) + (-10))
    P = (-5,5 - 3,5) + (12 - 10)
    P = -9 + 2
    P = -7


  • Exercice 1 :
    A = (+15) + (-25) =  15 - 25
    A = - 10 

    A = (+15) - (-25) = 15 + 25
    A = 40


    B = (-7) + (-7) = - 7 - 7
    B = -14 

    B = (-7) - (-7) = - 7 + 7
    B = 0


    C = (+9) + (+3) = 9 + 3
    C = 12 

    C = (+9) - (+3) = 9 - 3
    C = 6


    D = (-12) + (+20) = - 12 + 20
    D = 8 

    D = (-12) - (+20)  = - 12 - 20
    D = - 32


    E = (-10) + (+10) = -10 + 10
    E = 0

    E = (-10) - (+10)     = -10 - 10
    E = - 20


    _______________________________________________________________


    Exercice 2:

    Calculer les expressions suivantes en regroupant astucieusement.

    M = (-2) + (+3,25) - (+1,25) - (-2)
    M = - 2 + 3,25  - 1,25  + 2
    M = (3,25 - 1,25) +     (- 2 + 2)
    M =  2 + 0
    M = 2


    P = (-5,5) + (+12) - (+3,5) + (-10)
    P = - 5,5 + 12 - 3,5 - 10
    P = (- 5,5 - 3,5) + (12 - 10)
    P = - 9 + 2
    P = - 7

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