如何化简A{x|1<4/(x+3)},
问题描述:
如何化简A{x|1<4/(x+3)},
如题所示,为什么集合为{x|-3<x<1},而不是{x|x<1 x≠-3}
答
10
(4-x-3)/(x+3)>0
-(x-1)/(x+3)>0
(x-1)/(x+3)