(5-x)/(x^2-2x-3)<-1 5-x<-x^2+2x+30<-x^2+3x-2x^2-3x+2<0x^2-2x+1-x+1<0(x-1)^2-(x-1)<0当x>1时:两边同时除以x-1x-1-1<0,得:x<2当x<1时:两边同时除以x-1x-1-1>0,得x>2