Réponses

2014-02-01T15:34:56+01:00
XV7-5=3xV7+2
xV7-3xV7=5+2
-2xV7=7
x=-7/2v7
x=-7V7/14
2014-02-01T15:38:30+01:00
X(racine de 7) - 5 = 3x(racine de 7) + 2      
= x(racine de 7) - 5 -3x(racine de 7) - 2     = 0
= -2x(racine de 7) -9

2/
5x - (racine de 2) = 1 - 2x + 3( racine de 2)
5x - (racine de 2) - 1 +2x - 3( racine de 2)
7x - 4 (racine de 2) -1 = 7x-16-1 = 7x-17