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.
手机网页登录（网址:QY81.COM）手机网页登录_手机网页登录_手机网页登录_手机网页登录_手机网页登录手机网页登录_手机网页登录_手机网页登录_JJ2Ovb22v
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
