连续使用罗比达法则原式= lim [-sinx + xe^(-x²/2) ] / (4x³)= lim [-cosx +(1-x²)e^(-x²/2)] / (12x²)=lim [sinx + (x³-3x)e^(-x²/2)] / (24x)= 1/24 lim [ sinx / x + (x²...