Question

解下列不等式组

①{x-1＞2(x+1),1/2 x+1≥3- 5/2 x ②-1＜1- 1/2 x≤2

Answer 1

解:
(1)
①
x-1>2x+2
-3>x
②
3x>=2
x>=2/3
(2)
-1<1-1/2x<=2
-2<2-x<=4
-4<-x<=2
-2<=x<4