考试结束了,几位学生在考场里热议刚刚考过的试题,有的捶胸顿足,有的双手拍桌,有的不停自责直呼“我怎么这么傻,又忘记讨论直线斜率不存在的特殊情况了”“我又忘记直线方程的截距式的限制条件了”“我又忘记圆的一般方程的存在条件了”“我又忘记分类讨论了”等等,诸如此类的话题不绝于耳.请同学们想一想,为什么这么激动?为什么刚刚交过试卷就想到这些情况? The exam is over, several students in the examination room heat just passed the examination questions, and some crying, some hands making the table, some nonsense self-blame call “how I was so stupid, and forget to discuss the slope of the line does not exist ”“ I forget the intercept constraint of the linear equation ”“ I forget the existence of the general equation of the circle ”“ I forgot to discuss the classification ”and so on And so on, there’s so much to talk about, so why do you think so, why are you so excited?