Respuestas

2013-12-12T07:16:24+01:00
A. -1/4x+3≥x-1/2
1/2 + 3
≥ x + x/4
7/2
≥ 2x
x
≥ (7/2)/2
x
≥ 7/4
[ 7/4 ; +∞ [

B. 1/2(x+1)>x-3
x/2 + 1/2
> x - 3
3 + 1/2
> x - x/2
7/2
> x/2
2(7/2)
> x
7
> x
] -∞ ; 7 [