4x-3÷5+2x≥36x-3/5≥36x≥3+3/56x≥18/5x≥18/5乘以1/6x≥3/5 啊,我把题目搞错了.应该是(4x-3)/(5+2x)-3≥0(4x-3)/(5+2x)-3(5+2x)/(5+2x)≥0(4x-3-15-6x)/(5+2x)≥0(-2x-18)/(5+2x)≥0(x+9)/(5+2x)≤0-9≤x≤-5/2...