lim趋于无穷 x^2-1/2x^2-x-1.
问题描述:
lim趋于无穷 x^2-1/2x^2-x-1.
答
lim趋于无穷 x^2-1/2x^2-x-1
=lim趋于无穷 (x+1)(x-1)/(x-1)(2x+1)
==lim趋于无穷 (x+1)/(2x+1)
=1/2