在学习高一新教材第一章“简易逻辑”时 ,不少教师与同学在理解命题“p或 q”的真值表时常有两点疑问 .疑问 1 :按照“p或 q”的真值表 ,当 p真并且 q假时 ,命题“p或 q”是真命题 .如果 p:2是合数 ,q:2是质数 ,那么 ,“2是合数或者 2是质数”是真命题的结论令人难以接受 .疑问 When studying the “simple logic” in the first chapter of the new textbook, many teachers and classmates often have two questions in understanding the truth table of the proposition “p or q”. Question 1: According to the true value of “p or q” Table, when p is true and q is false, the proposition “p or q” is a true proposition. If p:2 is a composite number and q:2 is a prime number, then “2 is a composite number or 2 is a prime number” is a true proposition. The conclusion is unacceptable.