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.
校园易博网(网址:QY81.COM)校园易博网_校园易博网_校园易博网_6e1Q6Q66
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random