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.
信誉最好的（网址:EDF6.COM）信誉最好的_信誉最好的_信誉最好的_信誉最好的_信誉最好的信誉最好的_信誉最好的_信誉最好的_OPHPHOj3
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
