Jan 15, 2013 · Possible Duplicate: How do I convince someone that $1+1=2$ may not necessarily be true? I once read that some mathematicians provided a very length proof of $1+1=2$. Can you think of some way to

知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。

How do I calculate this sum in terms of 'n'? I know this is a harmonic progression, but I can't find how to calculate the summation of it. Also, is it an expansion of any mathematical function? 1 ...

有问题，上知乎。知乎，可信赖的问答社区，以让每个人高效获得可信赖的解答为使命。知乎凭借认真、专业和友善的社区氛围，结构化、易获得的优质内容，基于问答的内容生产方式和独特的社区机制，吸引、聚集了各行各业中大量的亲历者、内行人、领域专家、领域爱好者，将高质量的内 …

Possible Duplicate: Prove 0! = 1 0! = 1 from first principles Why does 0! = 1 0! = 1? All I know of factorial is that x! x! is equal to the product of all the numbers that come before it. The product of 0 and anything is 0 0, and seems like it would be reasonable to assume that 0! = 0 0! = 0. I'm perplexed as to why I have to account for this condition in my factorial function (Trying to learn ...

质数就是“只能被1和它本身整除”的自然数。 然而，我们必须在此基础之上增加一条警告，宣称数字1不是质数，这简直就像马后炮一样。

I'm not sure how appropriate it is to answer questions this old, but compared to the methods above, I feel the easiest way to see the answer to this question is to take a = -x And substitute that into the binomial expansion: (1+a)^n This yields exactly the ordinary expansion. Then, by substituting -x for a, we see that the solution is simply the …

但是，现实却是如同亩、平方公里、平方米一样傻傻分不清楚，需要换算才能进行比较。这片文章就带大家科普下关于热量相关知识。 1、热量的计量单位和换算 能量的单位是焦耳，简称焦 (J)，1000焦=1千焦 (KJ)。 这个热量单位通常在包装食物的营养成分表都可以看到。

目前视频DP接口最新版本1.4，HDMI最新版本2.1，均只支持最高到4K120Hz的视频信号。 那些4K144Hz甚至更高刷新率的显示器是怎么实现的?

Jun 29, 2025 · 本文是2025年流量卡选购指南，为大家在选购流量卡的过程中，答疑解惑，同时包含2025年高性价比流量卡推荐，方便选择困难症的知友查看。流量卡价格目前是全年最低点，是入手流量卡的好时机。 今年已经测评过30款新品手机卡，历时至今，已经获得900W+的阅读。