bonjour pouvezv ous m aider

Réponse :

Bonsoir ;

Explications étape par étape

1)

(2x-1) x 2 = (x-1)x5

4x-2 =5x-5

4x-2 -5x +5 =0

-x +3=0

x=3

2)  

3(2-x) = ( x-3) x(-2)

6-3x=-2x+6

6-3x+2x-6 = 0

-x +6-6 =0

-x=0

x=0

3)

x-1 =(x+3) x  (x)

x-1 =x²+3x

x-1 -x²-3x =0

-x²-2x-1 =0

-(x²+2x+1) =0

x²+2x+1 =0

(x+1)(x+1) =0

x=-1