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.
快乐八（网址:qmh8.com）快乐八_快乐八_快乐八_快乐八_快乐八快乐八_快乐八_快乐八_2SZSeHSZV
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
