2^[2x²-3x+1]＜(1/2)^[x²＋2x-5] 2^[2x²-3x+1]＜2^[-x²-2x+5]所以2x²-3x+1＜-x²-2x+5 3x²-x-4＜0 （3x-4）（x+1）＜ 0所以-1＜x＜4/3
