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.
必胜博注册（永久链接:SE8.TV）必胜博注册_必胜博注册_必胜博注册_必胜博注册_必胜博注册必胜博注册_必胜博注册_必胜博注册_OKVbbRkb
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
