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.
proumb官网(网址:QY81.COM)proumb官网_proumb官网_proumb官网_2dkxFxUU2
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random