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Bookmark or Share- 2（自然数之一）_百度百科2是最小的 质数 （也叫素数），也是唯一的 偶质数，只有1、2两个因数，是一个 有理数。 2也是黑格纳数。 [1] 以上均为“2”的 中文数字 表示，其中“二”是中文 小写 数字，“贰”是的中文大写数字，其余的是异体字。 大写数字 “贰”一般用于 银行 记账。 在 现代标准汉语 中， 数词 2在不同情况下，常常需要变换用字以适应使用需要，这一点在其他数词中是不存在或非常罕见的。 例如将“二”替换为“两”。 一般作 序数 时，应当用“二”（含省略“第”字的序数）。
- The Number 2 for kids - Learning to Count - YouTubeEducational video for children to learn number 2. The little ones will learn how to trace number 2, how to pronounce it and also how to count with a series o...
- 2 - Wikipedia2 (two) is a number, numeral and digit. It is the natural number following 1 and preceding 3. It is the smallest and the only even prime number. Because it forms the basis of a duality, it has religious and spiritual significance in many cultures.
- 2 Player Games - TwoPlayerGames.orgWorld's 2 player games platform. Daily updated best two player games in different categories are published for you.
- 2 -- from Wolfram MathWorldThe number two (2) is the second positive integer and the first prime number. It is even, and is the only even prime (the primes other than 2 are called the odd primes). The number 2 is also equal to its factorial since 2!=2.
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