(4x^3-2x^2+x)/(3x^2+2x)=(4x^2-2x+1)/(3x+2)x－>0(4x^2-2x+1)/(3x+2)=1/2因此lim(4x^3-2x^2+x)/(3x^2+2x)=?(x－>0）=1/2
