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.
用无穷等比和证明 。结果是精确的还是近似的?
用无穷等比和证明 。结果是精确的还是近似的?
Natural Language
Math Input
Extended Keyboard