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.
明升注册登入（网址:QY81.COM）明升注册登入_明升注册登入_明升注册登入_明升注册登入_明升注册登入明升注册登入_明升注册登入_明升注册登入_vcc3g3pcT
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
