在初三数学复习课中,高效的例题讲解,应以生为本,针对例题的自身特点和学生的实际情况,从思想、困惑、本质、变式等方面有所选择、有所侧重.或高屋建瓴,突出数学思想;或有的放矢,重评学生困惑;或追根溯源,讲清问题本质;或举一反三,做好变式训练等. In the first three math classes, the efficient examples should be based on students, focusing on the characteristics of the examples and the actual situation of the students, with some choices in terms of thinking, confusion, essence and variation, etc. Or high school building, highlighting the mathematical thinking; or targeted, rethinking student confusion; or tracing the source, to clarify the essence of the problem; or learn from one another, do variant training.