Question

Решите двойное неравенство:

-1<2x+1<1

Answer 1

-1<2x+1<1    /-1

-2<2x<0   /*1/2

-1<x<0

====================

 

Answer 2

-1>2x+1 и 2x+1<1
2x+1<-1     2x<0  

2x<-2          x<0
x<-1