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.
趣发娱乐（网址:QY81.COM）趣发娱乐_趣发娱乐_趣发娱乐_a3a1ygk1
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
