Mathématiques

Question

Les quel de ces calcul sont impossible ? svp
Exercice 1 : Développer si possible et réduire les expressions suivantes (6 points).

A = 2 + (x -3) – (2 – 3x)  B = 2(4x -5) – 7( 4x -2)  C = -3(1 + 2y) + 3y

D = 5 – ( - 2y + 3)   E = (2 + 3x)( 4x -7)                            F = (2x – 1)(-4x +3) + 2(3x -1)

1 Réponse

  • A = 2 + (x -3) – (2 – 3x)
    a = 2 +x-3-2+3x
    a =4x-3


    B = 2(4x -5) – 7( 4x -2)
    b = 8x-10-28x+14
    b = -20x+4

    C = -3(1 + 2y) + 3y
    c = -3 -6y +3y
    c = -3y -3

    D = 5 – ( - 2y + 3)
    d = 5 +2y -3
    d = 2y +2

     E = (2 + 3x)( 4x -7)
    e = 8x-14+12x²-21x
    e = 12x² -13x -14

     F = (2x – 1)(-4x +3) + 2(3x -1)

    f = -8x²+6x+4x-3 +6x-2
    f = -8x²+16x-5

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