Réponse :
COUCOU,
6x² = 54
x² = 9
x =V9 =3
5x² -13 =2x² +8
5x² -2x² = 8 -13
3x² = -5
x² = -5/3
x = V(-5/3)
3x² = 24
x² = 8
x = V8
8x² -13 = 187
8x² = 200
x² = 25
x = V25 =5
x² = 19
x= V19
(5x-4)2 -(3x-4)2 = 0
10x -8 -6x -8 =0
4x - 16 =0
4x = 16
x= 16/4 =4
(6x-5)2-(3x-6)2 =0
12x - 10 - 6x -12 = 0
6x -22 =0
6x = 22
x =22/6 = 3.66