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  1. 知乎 - 有问题,就会有答案

    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。

  2. Prove that $1^3 + 2^3 + ... + n^3 = (1+ 2 + ... + n)^2$

    Do you know a simpler expression for $1+2+\ldots+k$? (Once you get the computational details worked out, you can arrange them more neatly than this; I wrote this specifically to suggest a …

  3. Binomial expansion of $ (1-x)^n$ - Mathematics Stack Exchange

    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 …

  4. 想请大神给小白科普一下音频声道的专业知识,什么是2.1声道、5.…

    Oct 27, 2024 · 5.1声道的第一次使用,追溯到1976年,当时杜比实验室修改了Todd-AO 70毫米胶片上6个类比音轨的使用方式,但当时在电影《洛根的逃亡》中杜比实验室的光学矩阵编码系 …

  5. linear algebra - How to tell if a set of vectors spans a space ...

    @Javier: By definition, the rank of a matrix is the dimension off the span of its rows (which is equal to the dimension of the span of its columns); elementary row operations do not change …

  6. 游戏评测的 1% 最低帧(1% Low FPS)是什么意思? - 知乎

    2、最高性能 电脑性能冗余越大,1%就越接近平均帧。 通常来说,体验派的3A大作比如赛博朋克2077、荒野大镖客2,1%LOW在50以上时,就能带来不错的游戏体验。 而偏向PVP或者竞技 …

  7. Formula for $1^2+2^2+3^2+...+n^2$ - Mathematics Stack …

    Continue to help good content that is interesting, well-researched, and useful, rise to the top! To gain full voting privileges,

  8. 1/1+1/2+1/3+1/4+……+1/n=?怎么个解法? - 知乎

    两边求和,我们有 ln (n+1)<1/1+1/2+1/3+1/4+……+1/n 容易的, \lim _ {n\rightarrow +\infty }\ln \left ( n+1\right) =+\infty ,所以这个和是无界的,不收敛。

  9. Double induction example: $ 1 + q - Mathematics Stack Exchange

    You'll need to complete a few actions and gain 15 reputation points before being able to upvote. Upvoting indicates when questions and answers are useful. What's reputation and how do I …

  10. Word,插入多级列表,但是改了1.1,第二章的2.1也变成1.1,随着 …

    注1:【】代表软件中的功能文字 注2:同一台电脑,只需要设置一次,以后都可以直接使用 注3:如果觉得原先设置的格式不是自己想要的,可以继续点击【多级列表】——【定义新多级 …