拓展性例题有利于培养学生的发散性思维,有利于促进教师的专业发展,有利于构建和谐的课堂氛围。推展性例题编写应遵循“生活化”适度、难度适中和问题典型的原则。常见的拓展性例题编写方法有一题多变法、一题多问法、一题多解法等。 Expansionary examples are conducive to the development of divergent thinking of students is conducive to promoting the professional development of teachers is conducive to the construction of a harmonious classroom atmosphere. The compilation of expository examples should follow the principle of moderation, moderate difficulty and typical problems of “living”. A common method of developing the expansion of the example of a multi-change method, a multi-question method, a multi-solution method.