lim(x^2+x)lnx=lim(x+1)lnx/x^(-1)
=lim[lnx+(x+1)/x]/(-x^(-2))(洛必达法则)
=lim(xlnx+x+1)/(-x^(-1))
=lim(lnx+1+1)/(x^(-2))(洛必达法则)
=lim(1/x)/(-2x^(-3))(洛必达法则)
=-1/2limx^2=0
lim(x^2+x)lnx=lim(x+1)lnx/x^(-1)
=lim[lnx+(x+1)/x]/(-x^(-2))(洛必达法则)
=lim(xlnx+x+1)/(-x^(-1))
=lim(lnx+1+1)/(x^(-2))(洛必达法则)
=lim(1/x)/(-2x^(-3))(洛必达法则)
=-1/2limx^2=0