Mathématiques

Question

A= 4x+(2x+1)(5x-3)
B=(x+3)(y+9)+10x-7
C=(3x-5)(7+6x)-(7+x)
D=5x+1-(x+4)(x-9)
merci pour vos réponses!!<3

2 Réponse

  • A= 4x + (2x + 1)(5x - 3)
    A= 4x + 10x² - 6x + 5x - 3
    A= 10x² + 3x - 3

    B= (x + 3)(y + 9) + 10x - 7
    B= xy + 9x + 3y + 27 + 10x - 7
    B= xy + 19x + 3y + 20

    C= (3x - 5)(7 + 6x) - (7 + x)
    C= 21x + 18x² - 35 - 30x - 7 - x
    C= 18x² - 10x - 42

    D= 5x + 1 - (x + 4)(x - 9)
    D= 5x + 1 - (x² - 9x + 4x - 36)
    D= 5x + 1 - x² + 9x - 4x + 36
    D= - x² + 10x + 37
  • A = 4x + (2x + 1) (5x - 3)
    A = 4x + 10x² - 6x + 5x - 3
    A = 10x² + 4x + 5x - 6x - 3
    A = 10x² + 3x - 3

    B = (x + 3) (y + 9) + 10x - 7
    B = xy + 9x + 3y + 27 + 10x - 7
    B = xy + 19x + 3y + 20

    C = (3x - 5) (7 + 6x) - (7 + x)
    C = 21x + 18x² - 35 - 30x - 7 -  x
    C = 18x² + 21x - 30x -  x - 35 - 7
    C = 18x² - 10x - 42

    D = 5x + 1 - (x + 4) (x - 9)
    D = 5x + 1 - (x² - 9x + 4x - 36)
    D = 5x + 1 - x² + 9x - 4x + 36
    D = - x² + 5x + 9x - 4x + 1 + 36
    D = - x² + 10x + 37

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