Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
f 有 limit as x -> a^+ of = L_1 与 ，。 双侧存在？（答：否。）
f 有 limit as x -> a^+ of = L_1 与 ，。 双侧存在？（答：否。）
Natural Language
Math Input
Extended Keyboard
