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.
bg视讯开户（永久链接:SE8.TV）bg视讯开户_bg视讯开户_bg视讯开户_bg视讯开户_bg视讯开户bg视讯开户_bg视讯开户_bg视讯开户_qC3SM3C6C
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
