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.
世纪平台（网址:QY81.COM）世纪平台_世纪平台_世纪平台_世纪平台_世纪平台世纪平台_世纪平台_世纪平台_ci3uC3pip
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
