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.
讯网（网址:qmh8.com）讯网_讯网_讯网_讯网_讯网讯网_讯网_讯网_n693h3Jh
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
