X²-2X-3>0(X-3)(X+1)>0X<-1或X>3
{x>3或x<-1}
x大于3或者x<-1
分解因式(x-3)*(x+1)>0 x>3或 x<-1
x²-2x-3>0(x-3)(x+1)>0x-3>0且x+1>0得x>3x-3<0且x+1<0得x<-1