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.
webapp（永久链接:SE8.TV）webapp_webapp_webapp_webapp_webappwebapp_webapp_webapp_s3s0x4s3s
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
