“世界上每天都有人出生,是可能、不可能还是一定的?”这是人教版小学数学三年级(上册)“可能性”中的教学内容。这个表面看上去很简单的问题,却在数学教师中产生了争执。一部分教师认为:世界之大、人口之多,世界上每天都有人出生是一定的,为必然事件。另一部分教师则认为:虽然世界很大、人口很多,但谁能保证不会出现某年中的某一天,出现没有一个人出生这种极端的情况呢?所以世界上每天都有人出生应是可能的,为可能事件。 “Every day in the world, people are born, is it possible, impossible or certain?” This is the PEP teaching third grade (the first volume) “Possibilities” in the teaching content. This apparently seemingly simple problem has created a dispute among math teachers. Some teachers think: It is a certain event and a necessary event that the birth of a person in the world is large and has a large population. Some teachers think that although the world is large with a large population, who can promise that one day in a year will not occur and that no one is born to such an extreme situation? So it is possible that every day in the world people are born For possible events.