所谓定年题,就是指推算矿石年龄或古生物死亡年代的题目。很多学生求解此类问题思路混乱、错误百出。对此,笔者采取三步解题法教学,收到了较好效果。现举例说明: The so-called dating problem refers to the problem of deriving the age of ore or the age of paleontology. Many students are confused and wrong in solving such problems. In this regard, the author took a three-step problem solving method and received good results. Here is an example: