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.
博狼娱乐(网址:QY81.COM)博狼娱乐_博狼娱乐_博狼娱乐_zBz8M8x20
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random