解;2x-1/x+3≥0得2x-1≥0 2x-1<=0 x+3≥0 或 x+3<=0 ∴解为x≥1/2或x<=-3
(2x-1)/(x+3)≥0相当于(2x-1)（x+3)≥0x≥1/2或x≤-3
x＞＝1／2，x＜－3
