3x-5/x²+2x-3≤2(3x-5)/(x²+2x-3)-2(x²+2x-3)/(x²+2x-3)≤0(3x-5-2x²-4x+6)/(x²+2x-3)=0即(x+3)(x+1)(2x-1)(x-1)>=0(x+3)(x-1)≠0所以x>1或-1