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.
博讯主页（网址:QY81.COM）博讯主页_博讯主页_博讯主页_博讯主页_博讯主页博讯主页_博讯主页_博讯主页_q2H2HWq62
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
