Answered

Pouvez-vous m’aider à résoudre les équations suivantes merci d’avance :
1°) 10 (2 x-3) = 5x
2°) - 2 (3 + 2 x)=3-(2x-3)
3°) 6 (2-5x)=-5(x+1)

Sagot :

MAUDMARINE

Bonjour

1°) 10 (2 x-3) = 5x

20x - 30 = 5x

20x - 5x = 30

15x = 30

x = 30/12

x = 2

2°) - 2 (3 + 2 x)=3-(2x-3)

- 6 - 4x = 3 - 2x + 3

- 4x + 2x = 3 + 3 + 6

- 2x = 12

x = - 12/2

x = - 6

3°) 6 (2-5x)=-5(x+1)

12 - 30x = - 5x - 5

- 30x + 5x = - 5 - 12

- 25x = - 17

x = 17/25.

ZALOCASSIOPEE
1•) 20x -30 =5x
20x -5x =30
15x = 30
x = 30/15
x = 2

2•) -6 -4x = 3 -2x +3
-4x +2x = 6 + 3 + 3
-2x = 12
x = 12/-2
x = -6


3•) 12 -30x = -5x -5
-30x + 5x = -5 -12
-25x = -17
x = -17/-25
x = 17/25
environ= 0,68