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
