Question

18．判定下面的結(jié)果是奇數(shù)還是偶數(shù)．（1）785+547的和是B（2）奇數(shù)x奇數(shù)的積是A
A．奇數(shù)               B．偶數(shù)．

Answer 1

分析 據(jù)數(shù)的奇、偶性特點(diǎn)：偶數(shù)+偶數(shù)=偶數(shù)，偶數(shù)-偶數(shù)=偶數(shù)，奇數(shù)+奇數(shù)=偶數(shù)，奇數(shù)-奇數(shù)=偶數(shù)，奇數(shù)+偶數(shù)=奇數(shù)，奇數(shù)×奇數(shù)=奇數(shù)，奇數(shù)×偶數(shù)=偶數(shù)；進(jìn)行解答即可．

解答 解：785是奇數(shù)，547是奇數(shù)，根據(jù)：奇數(shù)+奇數(shù)=偶數(shù)，所以785+547的和是偶數(shù)；
根據(jù)：奇數(shù)×奇數(shù)=奇數(shù)，所以奇數(shù)x奇數(shù)的積是奇數(shù)；
故選：B、A．

點(diǎn)評(píng) 此題考查了數(shù)的奇偶性的特點(diǎn)，奇數(shù)+奇數(shù)=偶數(shù)，奇數(shù)×奇數(shù)=奇數(shù)．