Bonjour aide moi stp est arrête de supprime ma question

Réponse :

Bonjour,

Exercice 5:

A) 5x - 1 = 3x + 9  -> 5x - 3x = 9 + 1 -> 2x = 10 -> x = 5

B) x + 8 = 2x - 7 -> x - 2x = -7 - 8 -> -x = - 15 -> x=15

C) 25 + 5x =  7 - 3x -> 5x + 3x =  7 - 25 -> 8x =  - 18 -> x= -2,25

D) [tex]\frac{x}{5}[/tex] - 8 = 10 -> x= 90

E) [tex]10^{2}[/tex]x = [tex]10^{5}[/tex]  -> x = [tex]10^{3}[/tex]

Exercice 6:

A ->4x + (3x-1) - 3 = 8x - 2x + 4

  -> 4x + 3x - 1 - 3 = 8x - 2x + 4

  -> 7x - 4 = 6x + 4

  ->  7 x - 6 x = 4 + 4  

  -> x = 8

B) -> 5x - (x - 4) =20

   -> 5x - x + 4 = 20

   -> 4x = 20 - 4

   -> 4x = 16

   ->x = 4

C) -> 3 - (8x +1) = 2x- 4

    -> 3 - 8x - 1 = 2x - 4

    -> 2 - 8x = 2x - 4

    -> - 8x - 2x = - 4 - 2

    -> - 10x = - 6

     -> 10x = 6

     -> x = 0,6

D) ->( x - 2) + ( - x - 4) = 5x + ( - 2x + 16 )

    -> x - 2 - x - 4 = 5x - 2x + 16

    ->  - 6 = -3x + 16

    -> - 6 - 16 = - 3x

     ->  24 = 3x

     -> x = 8

Ps: je ne vois pas le E.