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.
iOSTF签名到期提醒*TG:@super4dog.kdw
iOSTF签名到期提醒*TG:@super4dog.kdw
Natural Language
Math Input
