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.
从 t 表中找： t_(0,025; 19) 。（答： 2,093 。）
从 t 表中找： t_(0,025; 19) 。（答： 2,093 。）
Natural Language
Math Input
Extended Keyboard
