求极限lim x->无限 2x^2-1/x^2+2x

问题描述:

求极限lim x->无限 2x^2-1/x^2+2x

lim(x->∝)(2x^2-1)/(x^2+2x)
=lim(x->∝)(2-1/x^2)/(1+2/x)
=2