bonsoir,
équations, pas inéquations
1) 2x/3-4 = (3x+3)/4
tt sous 12
(8x-48)/12 = (9x+9)/12
8x-48 = 9x+9
8x-9x = 9+48
-x = 57
x = -57
2) (4x+3)(3x-2)-(7-3x)(4x+3) = 0
(4x+3)(3x-2-7+3x) =0
(4x+3)(6x-9) = 0
3(4x+3)(2x-3) =0
4x+3 = 0
4x =-3
x =-3:4
2x-3 =0
2x =3
x =3/2
3) (x-2)²-6 =.
(x-2-V6)(x-2+V6) =
x =2+V6
x= 2-v6
4) (2x-3)(2x+3)-(2x+3)(x+2) =0
facto comme 2)
5) je sais pas
6) x(x+3) = 3(x+2)
x²+3x = 3x+6
x²+3x-3x = 6
x² = 6
x =V6 ou -V6