分解因式的提公因式法中找公因式的方法和分式通分(或解分式方程去分母时)找各分母的最简公分母时的方法非常类似,在解决这两类问题时学生很容易混淆,经常出错.为了帮助学生很好地解决这两个问题,我在教学中给学生总结出下列方法,使学生真正澄清了糊涂认识,突破了这两个难点. The method of finding the common factor in fractional factorial method and the fractional generalization (or split fractional equation to denominator) are very similar when finding the simplest common denominator of each denominator. Students are very easy to confuse and often make mistakes. To help students solve these two problems well, I summarize the following methods for students in the teaching, so that students can truly clarify the confusion and break through these two difficulties.