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.
天空网（网址:EDF6.COM）天空网_天空网_天空网_V1bFV1KFF
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
