lim(x→0) (x^2+1)/(3x^2-x-1) =

问题描述:

lim(x→0) (x^2+1)/(3x^2-x-1) =

把x=0直接代入得极限为-1

答:直接代入进去即可
lim(x→0) (x^2+1)/(3x^2-x-1)
=(0+1)/(0-0-1)
=-1