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.
三牛登录首页（永久链接:SE8.TV）三牛登录首页_三牛登录首页_三牛登录首页_三牛登录首页_三牛登录首页三牛登录首页_三牛登录首页_三牛登录首页_9s21b2223
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
