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.
星辉注册开户（永久链接:SE8.TV）星辉注册开户_星辉注册开户_星辉注册开户_星辉注册开户_星辉注册开户星辉注册开户_星辉注册开户_星辉注册开户_H2zgCgjC2
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
