0是偶數(shù)還是奇數(shù)(2020是偶數(shù)還是奇數(shù))
2024-03-28
更新時(shí)間:2024-03-28 15:04:34作者:未知
0是偶數(shù)。若某數(shù)是2的倍數(shù),就是偶數(shù)(雙數(shù)),可表示為2n;否則,就是奇數(shù)(單數(shù)),可表示為2n+1(n為整數(shù)),即奇數(shù)(單數(shù))除以二的余數(shù)是一。0是一個(gè)特殊的偶數(shù),既是正偶數(shù)與負(fù)偶數(shù)的分界線,又是正奇數(shù)與負(fù)奇數(shù)的分水嶺。
1~10之間的奇數(shù)有:1、3、5、7、9。奇數(shù)也俗稱“單數(shù)”,是指不能被2整除的整數(shù)。奇數(shù)可以分為正奇數(shù)和負(fù)奇數(shù),可用數(shù)學(xué)表達(dá)式2n+1(n為整數(shù))表示。
奇數(shù)加偶數(shù)是整數(shù)。因?yàn)榕紨?shù)和奇數(shù)是建立在整除的意義基礎(chǔ)之上,所以偶數(shù)和奇數(shù)都是整數(shù)。整數(shù)一定是奇數(shù)或偶數(shù)。因?yàn)槟鼙?整除的數(shù)是偶數(shù)。0是偶數(shù),負(fù)整數(shù)能被2整除也是偶數(shù)。不能被2整除的整數(shù)是奇數(shù)。但整數(shù)不一定是奇數(shù)或偶數(shù),因?yàn)檎麛?shù)包括正整數(shù)、負(fù)整數(shù)和零。
奇數(shù)偶數(shù)順口溜:奇數(shù)加減奇數(shù)得偶數(shù),偶數(shù)加減偶數(shù)得偶數(shù);奇數(shù)加減偶數(shù)得奇數(shù),偶數(shù)加減奇數(shù)得奇數(shù)。奇數(shù)乘以奇數(shù)得奇數(shù),偶數(shù)乘以偶數(shù)得偶數(shù);奇數(shù)乘以偶數(shù)得偶數(shù),偶數(shù)乘以奇數(shù)得偶數(shù)。