Mathématiques

Question

Bien le Bonour ,

Petite exercice , résoudre les équations suivantes :

a. ( 5x + 1 )( 8 - x ) = 0
b. ( 3x - 1 ) + ( 7- x ) = 0
c. ( 8 + 3x ) - ( x + 3 ) = 0
d. ( 3 - 10x )( x + 23 ) = 0

Merci d'avance !

1 Réponse

  • a. ( 5x + 1 )( 8 - x ) = 0
    5x + 1 = 0
    x = 1/5
    et
    8 - x = 0
    x = - 8

    b. ( 3x - 1 ) + ( 7- x ) = 0
    3x - 1 + 7 - x = 0
    3x - x = - 7 + 1
    2x = - 6
    x = - 6/2
    x = - 3

    c. ( 8 + 3x ) - ( x + 3 ) = 0
    8 + 3x - x - 3 = 0
    3x - x = - 8 + 3
    2x = - 5
    x = - 5/2

    d. ( 3 - 10x )( x + 23 ) = 0
    3 - 10x = 0
    - 10x = - 3
    x = 3/10
    et
    x + 23 = 0
    x = - 23

Autres questions