不久前,笔者有幸参加了江苏省初中数学“同题异构”暨名师论坛活动,有颇多感悟和收获.其中,有一位教师在课堂引入时发生了一个节外生枝的问题,这个问题在接下来的课堂研讨中,争论比较激烈,笔者因此对之进行了深入的探究,既找到了学生错误解法的原因,又探究出了解决这类问题的一般方法,特整理成文,以飨读者.一、题目老师今年42岁,小明今年13岁,问经过多少年后,老师的年龄老师是小明年龄的2倍? Not long ago, I was fortunate enough to participate in the junior middle school mathematics in Jiangsu Province “with the same problem Heterogeneous” teacher forum activities, there are quite a number of insights and gains, of which there was a teacher introduced a problem in the classroom, this problem In the next class discussion, the debate was fierce. Therefore, the author conducted an in-depth exploration of it, which not only found the reason of the students’ wrong solution, but also explored the general methods of solving such problems. First, the title teacher 42 years old this year, Xiao Ming 13 years old this year, ask how many years after the teacher’s teacher age is 2 times the age of Xiao Ming?