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Burger King(汉堡王)的优惠 by xiaoyuanwmm

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· @xiaoyuanwmm ·
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Burger King(汉堡王)的优惠
今天Burger King推出了一个新的优惠,做道数学题获得一个免费的汉堡

自己并不怎么吃Burger King,因为他们家的儿童套餐的玩具实在太丑了!

但是看到解数学题送免费汉堡这个活动,被数学题给吸引到了

所以就下载了他家的APP看看是什么数学题

看了一下题目,看起来很复杂,其实很简单:

![ca7f53f8959e2047cb1d9498b1a3584.jpg](https://cdn.steemitimages.com/DQmZjNeVhQYE1Q3BjiaBXGSKUGDpsyNb6EajcUDr2Xbj5Xs/ca7f53f8959e2047cb1d9498b1a3584.jpg)

第一部分,[5!x5/4!]^1/2, 可以分成[5x5x4!/4!], 得到25, 25的1/2平分就是5
第二部分,(-1)^i, i 是从1到461, 其实就是看是正数还是负数, 461是奇数,所以大括号里面的结果是负数。
结合第一部分和第二部分,大括号里面的结果是-5.
因为外面还有一个负号,所以负的-5等于5. 答案是5

填入答案5获得免费汉堡的优惠券

换了一个手机,发现还是同一道题,Burger King可以考虑一下添加多点习题,做些习题比吃汉堡有趣点
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