Question

兩個(gè)奇數(shù)相乘，積一定是（　�。�

A．素?cái)?shù)

B．合數(shù)

C．偶數(shù)

D．奇數(shù)

Answer 1

分析：根據(jù)奇數(shù)和偶數(shù)的定義：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)；及奇數(shù)和偶數(shù)的性質(zhì)：奇數(shù)與奇數(shù)的積是奇數(shù)；偶數(shù)與偶數(shù)的積是偶數(shù)；奇數(shù)與偶數(shù)的積是偶數(shù)；由此解答即可．

解答：解：根據(jù)上面的分析得：奇數(shù)×奇數(shù)=奇數(shù)，如：3×5=15，3×7=21；
答：兩個(gè)奇數(shù)相乘，積一定是奇數(shù)．
故選：D．

點(diǎn)評(píng)：此題考查的目的是使學(xué)生理解偶數(shù)與奇數(shù)的意義，掌握奇數(shù)和偶數(shù)的性質(zhì)，根據(jù)其性質(zhì)進(jìn)行分析解答．