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.
伊人论坛(网址:EDF6.COM)伊人论坛_伊人论坛_伊人论坛_n2JJSSinS
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random