擴(kuò)展信息:偶數(shù)和奇數(shù)具有以下性質(zhì):(1)兩個(gè)連續(xù)的整數(shù)必是一個(gè)奇數(shù)一個(gè)偶數(shù)；(2)奇數(shù)和奇數(shù)的和或差為偶數(shù)；與偶數(shù)的和或差奇數(shù)是奇數(shù)；任意數(shù)量的偶數(shù)之和為偶數(shù)；奇數(shù)之和奇數(shù)是奇數(shù)；兩者之和奇數(shù)為偶數(shù)；(3)兩個(gè)奇(偶)數(shù)的和或差是偶數(shù)；偶數(shù)和a奇數(shù)的和或差一定是奇數(shù)；(4)除2以外的所有正數(shù)和偶數(shù)都是合數(shù)；(5)相鄰偶數(shù)的最大公約數(shù)為2，最小公倍數(shù)為它們乘積的一半；(6)-0/和-0/的乘積為-0/；偶數(shù)的乘積是偶數(shù)；奇數(shù)偶數(shù)的積是偶數(shù)；(7)偶數(shù)位必須是0、2、4、6或8；奇數(shù)的單位必須是1、3、5、7...