0既不是正整數(shù),如,若有限個(gè)整數(shù)之積為奇數(shù),能夠被2整除的數(shù),則這些整數(shù)中至少有一個(gè)是偶數(shù) ,它是介于正整數(shù)和負(fù)整數(shù)的數(shù) ,2,任意多個(gè)偶數(shù)的和、差、積仍為偶數(shù),負(fù)整數(shù),整數(shù)的全體構(gòu)成整數(shù)集,什么是整數(shù)整數(shù)是什么,-2,如,正整數(shù),