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.
完美体育压球（网址:QY81.COM）完美体育压球_完美体育压球_完美体育压球_MMgpVzVz
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
