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2(二)是1与3之间的自然数,2是唯一的偶數質數 (又稱偶素數)。
偶数
如果一个整数能被2整除,就叫做偶数。反過來說,任何數乘以2即為偶數。对于用偶数进制书写的整数,例如十進制和十六進制,要判断它...
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