Réponses

2014-05-17T13:23:24+02:00
3x+2 / x - 5 >=0 
3x + 2 >= 0 ; x >= 2/3
4-7x/2x+1 >= 0 ; 4-7x >= 0 ; -7x >= - 4 ; x <= 4/7
3x + 7 / 3x +5 < 0 => 3x + 7 < 0 ; x < -7/3