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  • 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。
  • 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。
  • 1 8, 1 4, 1 2, 3 4,7 8英寸分别是多少厘米? - 知乎
    把1英寸分成8等分: 1 8 1 4 3 8 1 2 5 8 3 4 7 8 英寸。 This is an arithmetic sequence since there is a common difference between each term In this case, adding 18 to the previous term in the sequence gives the next term In other words, an=a1+d (n−1) Arithmetic Sequence: d=1 8
  • 空调的功率一般多大? - 知乎
    1 制冷量(3200w)和制热量(3650(4250)w),是空调的的输出功率。 这组数据表示空调的制冷和制热效果。 制冷时3200W,制热不带电加热是3650W,带上电加热是4250W,电加热功率为600W。
  • Word,插入多级列表,但是改了1. 1,第二章的2. 1也变成1. 1,随着改变而改变,这种情况怎么处? - 知乎
    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】——【定义新多级列表】,找到相应的位置进行修改
  • abstract algebra - Prove that 1+1=2 - Mathematics Stack Exchange
    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
  • 为什么 1 不能被认为是质数? - 知乎
    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。
  • 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




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