擴(kuò)展信息:關(guān)于偶數(shù)和奇數(shù)，它具有以下性質(zhì):(1)兩個(gè)連續(xù)的整數(shù)必是奇數(shù)偶數(shù)；(2)奇數(shù)之和或之差為偶數(shù)；偶數(shù)與奇數(shù)的和或差為奇數(shù)；偶數(shù)的任意數(shù)之和是偶數(shù)；奇數(shù)的和是奇數(shù)；偶數(shù)和奇數(shù)之和為偶數(shù)；(3)兩個(gè)奇(偶)數(shù)之和或之差為偶數(shù)；a偶數(shù)和奇數(shù)的和或差一定是奇數(shù)；(4)除2外，所有正數(shù)偶數(shù)都是合數(shù)；(5)鄰偶數(shù)的最大公約數(shù)是2，最小公倍數(shù)是它們乘積的一半；(6)奇數(shù)和奇數(shù)的乘積是奇數(shù)；偶數(shù)和偶數(shù)的乘積是偶數(shù)；奇數(shù)和偶數(shù)的乘積是偶數(shù)；(7)偶數(shù)的單位必須是0、2、4、6或8；奇數(shù)必須是1、3、5、7或9；(8...