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.
掷 2 骰子。 P(和 > 9) 。(答: 6/36 = 1/6 。)
掷 2 骰子。 P(和 > 9) 。(答: 6/36 = 1/6 。)
Natural Language
Math Input
Extended Keyboard