解：-X^2+2X+3=(3-x)(x+1)>0 3-x>0,x<3;x+1>0,x>-1 综脊吵猜祥合樱兆侍-1
两边乘-12x²+x-3<=0(2x+3)(x-1)<=0-3/2<=x<=1
x^2-2x-3<0(x-3)(x+1)<0-1
(x-3)(x+1)<0-1
-1
