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.
im网址体育（永久链接:SE8.TV）im网址体育_im网址体育_im网址体育_QF9K9KFR1
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
