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这道题的答案是5!简单数学题难住一堆人

数学这个科目令人感到头痛不已,网友们你们自认数学程度好吗?最近在网路上流传一道数学题,看似简单的题目,意外引起网友热烈的讨论。

solve carefully

25-55+(85+65)=

you probably won't believe it, but this equals 5!

你可能不相信,这道题的答案是5!

9d9e0d8fgw1ezrtu7v6y1j20fa09mq3m

网友讨论:


译文来源:三泰虎 http://www.santaihu.com/2016010802.html
外文地址: https://www.reddit.com/r/MathJokes/comments/3mqlae/thoroughly_confuse_your_friends_with_this_correct/



MadTux 28

I must confess .. I don't get it.

EDIT: Or is that the joke?

必须承认,我没有搞懂

这是笑话吗?

nissansilviafan 52


The joke is ! is factorial, not an exclamation point. So 5! = 5 * 4 * 3 * 2 * 1 = 120 which is also what 25-55+(85+65) equals.


笑点在“!”是阶层,不是感叹号


5的阶层就是5 * 4 * 3 * 2 * 1 = 120


MadTux 9


Oh. Now I feel stupid (._.)


哦,我现在感觉自己好傻啊



 
BadSmash4 5

Oh goddammit that's annoying hahaha. But it's good. I should have known when I got 120 but I was too focused on it not being five. Thanks for keeping me from going batshit.

哦,烦人,哈哈

本该懂的,就是老想着答案不该是5

 
Bromskloss 8

It took a while before I got it, because, contrary to the use of the word "solve", it was apparently not an equation with "YOU PROBABLY WON'T BELIEVE IT, BUT THIS EQUALS 5!" as the right-hand side.

In the end, it was just about interpreting the "!" as a factorial, which then means that there is a period missing after the sentence.

看了一会才懂

归根到底是要把“!”解读为阶层,也就是句子后面漏了一个句号

 
DirichletIndicator

Well, I'm thoroughly amused

好吧,我彻底被逗乐了

 
edderiofer

Posted this one to Facebook. Let's see how good my friends are at mathematics.

把这道题发到facebook上,看看我朋友的数学水平怎样

 
Chief Petosky Chief Petosky

I remember a stupid sales guy promising a client, "If you go with us, you can save $500,000!"

I thought, "No way, dude, my SOA calculator won't even calculate that."

我记得一位愚蠢的销售对客户承诺说:如果选择我们,你可以节省500000美元!

我想啊,不可能,老兄,我的计算器都算不过来呢

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