Réponses

2013-02-21T16:39:25+01:00
2013-02-21T16:43:21+01:00

a) (2x-3)(2x+3) <= 0
solution: x€[-3/2;3/2]
b) (x+3-2)(x+3+2) < 0
(x+1)(x+5) < 0
solution: x € ]-1;-5[