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.
pc平台(网址:qmh8.com)pc平台_pc平台_pc平台_pc平台_pc平台pc平台_pc平台_pc平台_5275265H
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random