读了2004年贵刊第3期的《为学生架起学习的天桥——单位“1”教学浅谈》一文,笔者认为潘老师的出发点是正确的,分数应用题教学的最关键环节就是要找准单位“1”,但是潘老师总结的还不够全面。例如,对于冰化成水体积减少112、一件商品降价25%等情况,如果用潘老师总结的三种方法 Read the 2004 issue of the third issue of “fly bridge for students to learn - unit” 1 “teaching” a text, I think Mr. Pan's starting point is correct, the fraction of the most important part of teaching is to apply Identify the unit “1”, but Pan is not summed up enough comprehensive. For example, for the ice into the water volume reduction of 112, a commodity price cuts 25% and so on, if the three methods summarized by Pan