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.
pg棋牌-复制：12399.CC-pg棋牌-网址：12399.CC-zp5kr
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
