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.
优德平台开户（网址:QY81.COM）优德平台开户_优德平台开户_优德平台开户_优德平台开户_优德平台开户优德平台开户_优德平台开户_优德平台开户_g3pXsp33s
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
