lim(2x^3+3x^2+5)/(7x^3+4x^2-1)

问题描述:

lim(2x^3+3x^2+5)/(7x^3+4x^2-1)

上下除以x^3
原式=lim(2+3/x+5/x^3)/(7+4/x-1/x^3)
=(2+0+0)/(7+0-1)
=2/7