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.
京运体育app（网址:QY81.COM）京运体育app_京运体育app_京运体育app_京运体育app_京运体育app京运体育app_京运体育app_京运体育app_MrT1mPMr
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
