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.
无形干扰的咨询技巧咨询【企鹅383550880】√转ihbwel伍F5y
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random