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.
自己安慰自己的视频教程(网址:QY81.COM)自己安慰自己的视频教程_自己安慰自己的视频教程_自己安慰自己的视频教程_OHmQ1JQOJ
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random