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.
彩八注册（网址:EDF6.COM）彩八注册_彩八注册_彩八注册_彩八注册_彩八注册彩八注册_彩八注册_彩八注册_ZX25X2H2p
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
