Question

求极限lim(x趋于无穷)((x3+2x2-1)/(5x2+x))

Answer 1

lim(x趋于无穷)((x3+2x2-1)/(5x2+x))

=lim(x趋于无穷)((1+2/x-1/x3)/(5/x+1/x2))

=(1+0-0)/(0+0)

=无穷