Question

30名學(xué)生要分成甲，乙兩隊(duì)．如果甲隊(duì)人數(shù)為奇數(shù)，乙隊(duì)人數(shù)為奇數(shù)還是偶數(shù)？如果甲隊(duì)人數(shù)為偶數(shù)呢？

Answer 1

考點(diǎn)：奇數(shù)與偶數(shù)的初步認(rèn)識(shí)

專題：數(shù)的整除

分析：根據(jù)數(shù)的奇偶性：奇數(shù)+奇數(shù)=偶數(shù)，偶數(shù)+偶數(shù)=偶數(shù)，由此即可得解．

解答： 解：30名學(xué)生要分成甲，乙兩隊(duì)，因?yàn)椋浩鏀?shù)+奇數(shù)=偶數(shù)，偶數(shù)+偶數(shù)=偶數(shù)，
如果甲隊(duì)人數(shù)為奇數(shù)，乙隊(duì)人數(shù)為奇數(shù)；如果甲隊(duì)人數(shù)為偶數(shù)，則乙隊(duì)人數(shù)為偶數(shù)；
答：如果甲隊(duì)人數(shù)為奇數(shù)，乙隊(duì)人數(shù)為奇數(shù)；如果甲隊(duì)人數(shù)為偶數(shù)，則乙隊(duì)人數(shù)為偶數(shù)．

點(diǎn)評(píng)：此題應(yīng)根據(jù)數(shù)的奇偶性進(jìn)行分析、解答．