课本例题具有曲型性和示范性,在例题教学中,教师应在熟练驾驭教材的基础上,尽量对例题作多角度、全方位、深层次的剖析,充分挖掘其内在联系与蕴涵。换言之,教师既要研究例题中带有规律性、全局性和推广性的解法,更要不失时机地启发诱导学生横向沟通、多方探求。即变化例题中的条件和设问方式,一题多变,把例题向纵深引入,发挥典型例题的辐射作用,让学生解一题懂一串,学 The examples of textbooks are curvilinear and exemplary. In the example teaching, teachers should try to analyze the examples by multi-angles, all-directions, and deep-level analysis on the basis of mastering the teaching materials, and fully explore their internal connections and implications. In other words, the teacher must study the solution to the regularity, the overall situation, and the promotion in the examples, and must not lose the opportunity to inspire the students’ horizontal communication and multi-exploration. That is, the conditions and the way of asking questions in the changing examples are varied. The example questions are introduced into the depth to show the radiation effect of the typical example questions, so that the students can understand and understand the problem.