整數(shù)中,不能被2整除的數(shù)是奇數(shù)奇數(shù)可用2k+1表示,這里k是整數(shù).關(guān)于奇數(shù),有下面的性質(zhì)：（1）奇數(shù)不會(huì)同時(shí)是偶數(shù)；兩個(gè)連續(xù)整數(shù)中必需有一個(gè)是奇數(shù)；（2）奇數(shù)個(gè)奇數(shù)和是奇數(shù)；（3）兩個(gè)奇數(shù)的差是偶數(shù)；一個(gè)奇數(shù)與一...