2-x/2<(x+1)/312-3x<2x+210<5xx>2……①3x+1≥2[x-(1/2)]3x+1≥2x-1x≥-2……②由①②得，x>2
2-(x/2)＜（x+1/3) x>10/93x+1≥2[x-(1/2)] x>=-2则 x>10/9
（-3/4)≤x<（10/9）
