xx<1/xx当x>0,不等式同时乘以x: x^2<1当x<0,不等式同时乘以x:x^2>1>x^3,解得:x<-1综合得x的取值范围是:x<-1
x当x>0,不等式同时乘以x: x^2<1当x<0,不等式同时乘以x:x^2>1>x^3,解得:x<-1综合得x的取值范围是:x<-1