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- 1 - Wikipedia
1 (one, unit, unity) is a number, numeral, and glyph It is the first and smallest positive integer of the infinite sequence of natural numbers
- 1（自然数之一）_百度百科
1，是一个阿拉伯数字。 1是一个自然数，是最小的正整数，是最小的正奇数。 1是一个有理数，是一位数，也是奇数。 1既不是质数也不是合数。 1的n次方（n∈R）都等于1。 1的倒数是它本身。 一个或者几个事物所组成的整体，可以看作是单位“1”。
- 如何定义什么是 1？ - 知乎
我们可以从数学上证明 1+1=2，但是如何定义 1 是什么。如果说是 0 的后继数，那又如何定义 0 呢？
- 1 - 维基词典，自由的多语言词典
文字形式是由 ︎ 強制指定 的，而表情符號形式是由 ️ 強制指定的。 10世纪，阿拉伯數字尼泊尔形式的“西部阿拉伯”变体（对照天城文 १ (éka)），可能受到了罗马数字 Ⅰ 的影响。 数字‘ 1 ’在七段数码管内的表示方法。 1 (前 0，后 2) (語音學，漢字文化圈，通常上標) 一聲，通常與 陰平 相關聯。 如果不區分陰陽，可以簡單地稱為 平聲 （四聲）。 挪威語 瑞典語的調素1有時用一個簡單的主音標記轉寫 ˈ。 十进制系统中等价： 基数中等价： 1的其他 表徵： 时长：1秒。 0:01 (網路用語， 駭客語， 諷刺) ! 的故意誤拼，模仿打感叹号太激动时没有按住 shift 键导致的情况。 A:sum1 hlep me plz im alwyz l0zin!!1!?! ?
- 1 (number) - New World Encyclopedia
The glyph used today in the Western world to represent the number 1, a vertical line, often with a serif at the top and sometimes a short horizontal line at the bottom, traces its roots back to the Indians, who wrote 1 as a horizontal line, as is still the case in Chinese script
- Number 1 - Curious Math Facts and Interesting Properties
Explore the curious properties of number 1, an odd number which is uniquely neither prime nor composite Includes mathematical info, prime factorization, divisors, bases and much more!
- The number one - Britannica
To write a large number in scientific notation, one moves the decimal place to the left to form a number between 1 and 10 One then counts the number of places the decimal place was moved to the left The base number 10 is raised to the power of the number of places the decimal was moved to the left
- 1 (Number)
In scientific notation, it is written as 1 × 10 0 It has a total of 0 prime factors and 1 positive divisors There is one positive integer (up to 1) that is relatively prime to 1 The prime factorization of 1 is 1 Since it has a total of 0 prime factors, 1 is a composite number
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