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.
PP电子官方入口（网址:EDF6.COM）PP电子官方入口_PP电子官方入口_PP电子官方入口_PP电子官方入口_PP电子官方入口PP电子官方入口_PP电子官方入口_PP电子官方入口_3jUV2jjV
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
