考點:奇數(shù)與偶數(shù)的初步認識,用字母表示數(shù)
專題:用字母表示數(shù)
分析:根據(jù)偶數(shù)、奇數(shù)的意義,自然數(shù)中,是2的倍數(shù)的數(shù)叫做偶數(shù),不是2的倍數(shù)的數(shù)叫做奇數(shù),偶數(shù)因數(shù)是2的倍數(shù),奇數(shù)偶數(shù)之積也是2的倍數(shù),因此,一個奇數(shù)與一個偶數(shù)的積一定是偶數(shù),據(jù)此解答即可.
解答:
解:偶數(shù)因數(shù)是2的倍數(shù),奇數(shù)偶數(shù)之積也是2的倍數(shù),因此,一個奇數(shù)與一個偶數(shù)的積一定是偶數(shù),如果M是偶數(shù),則5M一定是 偶數(shù).
故答案為:偶.
點評:本題主要是考查奇數(shù)、偶數(shù)的意義.