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- 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。
- 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 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 ordinary binomial expansion with alternating
- Mathematics Stack Exchange
Q A for people studying math at any level and professionals in related fields
- 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. 1声道、7. 1声道?
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统中,没有使用独立的环绕声,因此还不是真正的5 1,杜比实验室第一次在70毫米胶片中使用
- 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 way to proceed from where you got stuck )
- HDMI 规格详细整理!HDMI 2. 0、2. 1 差在哪? 选择哪个好?
HDMI 1 3b1 2007年8月1日提出 仅修正关于测试设备上Type C connector的固定器(fixture)的些微内容 HDMI 1 3c 2008年7月25日提出 和1 3b、1 3b1一样是为1 3a制订的测试标准 与之前版本的主要差异为线材的测试(增加线材测试条目或修正其内容有助于HDMI设备的互连兼容性)
- 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或者竞技类的游戏,需要高操作和专注力的,比如CSGO、LOL、赛车类的例如地平线、尘埃、F1。
- Formula for $1^2+2^2+3^2+. . . +n^2$ - Mathematics Stack Exchange
$ (n+1)^3 - n^3 = 3n^2+3n+1$ - so it is clear that the $n^2$ terms can be added (with some lower-order terms attached) by adding the differences of cubes, giving a leading term in $n^3$ The factor 1 3 attached to the $n^3$ term is also obvious from this observation
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