8x+1/5x+3>1 求x
问题描述:
8x+1/5x+3>1 求x
答
(8X+1)/(5X+3)-1>0
(8X+1-5X-3)/(5X-3)>0
(3X-2)/(5x-3)>0
等价于(3X-2)(5X-3)>0
X2/3