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.
注册送18体验(网址:QY81.COM)注册送18体验_注册送18体验_注册送18体验_uIRI2IIe2
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random