-4<-(1/2)x²-x-3/2<-2

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-4<-(1/2)x²-x-3/2<-2

-4<-(1/2)x²-x-3/2<-2
-4<-(1/2)x²-x-3/2<-2

-4<-(1/2)x²-x-3/2<-2
-4<-(1/2)x²-x-3/2
化简得到x^2+2x-5